{"id":23115,"date":"2026-10-10T07:00:00","date_gmt":"2026-10-10T06:00:00","guid":{"rendered":"https:\/\/www.sunflux.dk\/da\/?p=23115"},"modified":"2026-09-24T08:32:35","modified_gmt":"2026-09-24T07:32:35","slug":"grolys-i-drivhus","status":"publish","type":"post","link":"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus","title":{"rendered":"Grolys i drivhus \u2013 s\u00e5dan supplerer du dagslyset korrekt"},"content":{"rendered":"<p><strong>Kort svar:<\/strong> Grolys i drivhus bruges prim\u00e6rt som supplement, n\u00e5r dagslyset er for svagt eller dagen for kort. Det rigtige lysniveau afh\u00e6nger af afgr\u00f8de, \u00e5rstid og \u00f8nsket v\u00e6ksthastighed. LED-v\u00e6kstlys g\u00f8r det muligt at forl\u00e6nge dagen og stabilisere produktionen uden at skulle erstatte solen fuldst\u00e6ndigt.<\/p>\n<p>Se SunFlux&#8217; udvalg af <a href=\"https:\/\/www.sunflux.dk\/da\/led-specialbelysning\">grolys<\/a> og <a href=\"https:\/\/www.sunflux.dk\/da\/vaekstlys-og-plantelamper\">v\u00e6kstlys og plantelamper<\/a>.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Indholdsfortegnelse<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Hvorfor_bruge_grolys_i_et_drivhus\" >Hvorfor bruge grolys i et drivhus?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#PPFD_og_DLI_i_drivhus\" >PPFD og DLI i drivhus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Hvilke_planter_kraever_mest_lys\" >Hvilke planter kr\u00e6ver mest lys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Placering_af_armaturer\" >Placering af armaturer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Hvornaar_skal_lyset_vaere_taendt\" >Hvorn\u00e5r skal lyset v\u00e6re t\u00e6ndt?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Temperatur_og_fugt\" >Temperatur og fugt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Fuld_spektrum_eller_lilla_lys\" >Fuld spektrum eller lilla lys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Daempning\" >D\u00e6mpning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Foerspiring_i_drivhus\" >F\u00f8rspiring i drivhus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Grolys_i_drivhus_handler_om_at_udfylde_et_underskud\" >Grolys i drivhus handler om at udfylde et underskud<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Maal_dagslyset_i_stedet_for_at_gaette\" >M\u00e5l dagslyset i stedet for at g\u00e6tte<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#DLI_%E2%80%93_den_samlede_dagsdosis\" >DLI \u2013 den samlede dagsdosis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Tomater\" >Tomater<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Chili_og_peber\" >Chili og peber<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Salat_og_krydderurter\" >Salat og krydderurter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Montagehoejde\" >Montageh\u00f8jde<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Skygge_fra_armaturer\" >Skygge fra armaturer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Interlighting\" >Interlighting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Varme_og_LED\" >Varme og LED<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Luftfugtighed_og_kondens\" >Luftfugtighed og kondens<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Vanding_skal_foelge_lyset\" >Vanding skal f\u00f8lge lyset<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Daempning_efter_dagslys\" >D\u00e6mpning efter dagslys<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#IP-klasse_i_drivhus\" >IP-klasse i drivhus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Korrosion\" >Korrosion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Energioekonomi\" >Energi\u00f8konomi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Planlaegning_foer_koeb\" >Planl\u00e6gning f\u00f8r k\u00f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Relaterede_guides_til_vaekstlys_og_dyrkning\" >Relaterede guides til v\u00e6kstlys og dyrkning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Kan_grolys_erstatte_solen_i_drivhuset\" >Kan grolys erstatte solen i drivhuset?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Skal_grolys_vaere_taendt_hele_dagen\" >Skal grolys v\u00e6re t\u00e6ndt hele dagen?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Hvor_taet_skal_grolys_haenge\" >Hvor t\u00e6t skal grolys h\u00e6nge?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.sunflux.dk\/da\/blog\/vaekstbelysning\/grolys-i-drivhus\/#Er_4000K_almindelig_LED_nok\" >Er 4000K almindelig LED nok?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Hvorfor_bruge_grolys_i_et_drivhus\"><\/span>Hvorfor bruge grolys i et drivhus?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Et drivhus giver mere naturligt lys og varme end indend\u00f8rs dyrkning, men fra efter\u00e5r til tidligt for\u00e5r kan den samlede lysm\u00e6ngde stadig v\u00e6re for lav til kompakt og aktiv v\u00e6kst. Supplerende LED-lys kan forl\u00e6nge s\u00e6sonen og forbedre kvaliteten af forspiring og vinterdyrkning.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1774\" height=\"887\" src=\"https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter.webp\" alt=\"Grolys over tomater og gr\u00f8nne planter i et drivhus ved solnedgang\" class=\"wp-image-23287\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter.webp 1774w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-300x150.webp 300w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-1024x512.webp 1024w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-768x384.webp 768w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-1536x768.webp 1536w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-18x9.webp 18w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-drivhus-gyldent-lys-tomater-planter-500x250.webp 500w\" sizes=\"auto, (max-width: 1774px) 100vw, 1774px\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"PPFD_og_DLI_i_drivhus\"><\/span>PPFD og DLI i drivhus<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PPFD fort\u00e6ller, hvor meget fotosyntetisk aktivt lys planterne modtager lige nu. DLI beskriver den samlede m\u00e6ngde over dagen. I et drivhus kommer en del af DLI fra solen og resten kan leveres af LED.<\/p>\n<p>Det betyder, at grolyset ikke n\u00f8dvendigvis beh\u00f8ver k\u00f8re med samme effekt hele dagen.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hvilke_planter_kraever_mest_lys\"><\/span>Hvilke planter kr\u00e6ver mest lys?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Afgr\u00f8de<\/th>\n<th>Relativt lysbehov<\/th>\n<th>Bem\u00e6rkning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Salat<\/td>\n<td>Lavt til moderat<\/td>\n<td>Kan klare lavere niveauer<\/td>\n<\/tr>\n<tr>\n<td>Krydderurter<\/td>\n<td>Moderat<\/td>\n<td>Varierer mellem arter<\/td>\n<\/tr>\n<tr>\n<td>Chili<\/td>\n<td>H\u00f8jt<\/td>\n<td>Kr\u00e6ver godt lys til kompakt v\u00e6kst og frugt<\/td>\n<\/tr>\n<tr>\n<td>Tomat<\/td>\n<td>H\u00f8jt<\/td>\n<td>Frugts\u00e6tning kr\u00e6ver meget samlet lys<\/td>\n<\/tr>\n<tr>\n<td>Agurk<\/td>\n<td>H\u00f8jt<\/td>\n<td>Stor bladmasse og hurtig v\u00e6kst<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Placering_af_armaturer\"><\/span>Placering af armaturer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Armaturerne skal h\u00e6nge, s\u00e5 lysfordelingen bliver j\u00e6vn. For t\u00e6t placering kan give et kraftigt hotspot og stress, mens for stor afstand kan spilde lys uden for plantearealet. Juster h\u00f8jden efter armaturets optik og plantens v\u00e6kst.<\/p>\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1958\" height=\"803\" src=\"https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring.webp\" alt=\"Supplerende grolys over tomater og andre planter i drivhus ved skumring\" class=\"wp-image-23232\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring.webp 1958w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-300x123.webp 300w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-1024x420.webp 1024w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-768x315.webp 768w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-1536x630.webp 1536w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-18x7.webp 18w, https:\/\/www.sunflux.dk\/wp-content\/uploads\/2026\/09\/grolys-i-drivhus-supplerende-lys-ved-skumring-500x205.webp 500w\" sizes=\"auto, (max-width: 1958px) 100vw, 1958px\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Hvornaar_skal_lyset_vaere_taendt\"><\/span>Hvorn\u00e5r skal lyset v\u00e6re t\u00e6ndt?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I et drivhus kan lyset starte f\u00f8r solopgang, supplere p\u00e5 m\u00f8rke dage eller forl\u00e6nge efter solnedgang. Fotoperioden skal tilpasses afgr\u00f8den. Planter har ogs\u00e5 behov for m\u00f8rkeperioder, og konstant lys er sj\u00e6ldent den bedste l\u00f8sning.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Temperatur_og_fugt\"><\/span>Temperatur og fugt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ekstra lys \u00f8ger fotosyntesen og kan ogs\u00e5 \u00f8ge planternes vandforbrug. Samtidig bidrager elektrisk effekt til varme i drivhuset. S\u00f8rg for ventilation, s\u00e5 h\u00f8j luftfugtighed ikke bliver et problem.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Fuld_spektrum_eller_lilla_lys\"><\/span>Fuld spektrum eller lilla lys?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Moderne hvide fuldspektrum-armaturer g\u00f8r det lettere at arbejde i drivhuset og vurdere planternes farve. Specialiserede spektre kan v\u00e6re relevante, men den samlede m\u00e6ngde fotosyntetisk lys og effektiviteten er ofte vigtigere end en dramatisk farve p\u00e5 lyset.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Daempning\"><\/span>D\u00e6mpning<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>D\u00e6mpning kan v\u00e6re v\u00e6rdifuldt i drivhuse, fordi naturligt lys \u00e6ndrer sig hele tiden. Et d\u00e6mpbart system kan k\u00f8re lavere p\u00e5 lyse dage og h\u00f8jere p\u00e5 m\u00f8rke dage.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Foerspiring_i_drivhus\"><\/span>F\u00f8rspiring i drivhus<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Til sm\u00e5planter er j\u00e6vnhed vigtig. For lidt lys giver lange, spinkle planter. Kombin\u00e9r eventuelt drivhusets dagslys med mindre line\u00e6re v\u00e6kstlamper over bakkerne.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Grolys_i_drivhus_handler_om_at_udfylde_et_underskud\"><\/span>Grolys i drivhus handler om at udfylde et underskud<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I et drivhus b\u00f8r man t\u00e6nke p\u00e5 grolyset som supplement til solen. P\u00e5 en klar for\u00e5rsdag kan planterne f\u00e5 rigeligt lys midt p\u00e5 dagen, mens en gr\u00e5 decemberdag giver meget lidt. Den mest energieffektive l\u00f8sning er derfor at tilf\u00f8re lys, n\u00e5r den naturlige DLI ikke er tilstr\u00e6kkelig.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Maal_dagslyset_i_stedet_for_at_gaette\"><\/span>M\u00e5l dagslyset i stedet for at g\u00e6tte<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Et simpelt luxmeter er bedre end ingenting, men til professionel dyrkning er en PAR\/PPFD-m\u00e5ler mere relevant. Den viser det fotosyntetisk aktive lys, planterne faktisk modtager.<\/p>\n<p>Ved at m\u00e5le flere steder i drivhuset kan du ogs\u00e5 se, hvor skygger fra konstruktion, naboplanter og gardiner reducerer lysniveauet.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"DLI_%E2%80%93_den_samlede_dagsdosis\"><\/span>DLI \u2013 den samlede dagsdosis<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>DLI er en nyttig st\u00f8rrelse i drivhus, fordi naturligt lys varierer meget. Hvis planten mangler lys efter dagens naturlige indstr\u00e5ling, kan LED-lamperne k\u00f8re om morgenen, aftenen eller p\u00e5 m\u00f8rke tidspunkter.<\/p>\n<p>Det giver mere mening end at k\u00f8re grolyset med samme effekt 16 timer hver dag uanset sol.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Tomater\"><\/span>Tomater<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Tomater er lyskr\u00e6vende. Ved lavt lys bliver v\u00e6ksten ofte bl\u00f8dere, internoder l\u00e6ngere, og frugts\u00e6tningen svagere. Til vinterproduktion kr\u00e6ves et betydeligt supplement sammenlignet med blot forspiring.<\/p>\n<p>Det er ogs\u00e5 vigtigt, at temperaturen passer til lysniveauet. H\u00f8j temperatur og lavt lys giver let strakt v\u00e6kst.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Chili_og_peber\"><\/span>Chili og peber<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Chili reagerer tilsvarende positivt p\u00e5 godt lys. Under forspiring kan et moderat LED-lys t\u00e6t p\u00e5 planterne v\u00e6re nok, mens store frugtb\u00e6rende planter kr\u00e6ver langt mere.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Salat_og_krydderurter\"><\/span>Salat og krydderurter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Disse afgr\u00f8der kan dyrkes ved lavere lysniveauer end tomat og agurk. Det g\u00f8r supplerende lys mere \u00f8konomisk, is\u00e6r i efter\u00e5r og tidligt for\u00e5r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Montagehoejde\"><\/span>Montageh\u00f8jde<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>En kraftig lampe h\u00f8jt over planterne d\u00e6kker et st\u00f8rre areal, men mere lys rammer gangarealer og konstruktion. Flere mindre armaturer t\u00e6ttere p\u00e5 afgr\u00f8den kan give bedre ensartethed.<\/p>\n<p>Den optimale l\u00f8sning afh\u00e6nger af drivhusets bredde, bordopstilling og planteh\u00f8jde.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Skygge_fra_armaturer\"><\/span>Skygge fra armaturer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I drivhus er armaturet selv en fysisk genstand, der kan skygge for sollys. Store brede armaturer kan derfor koste naturligt lys i dagtimerne. Smalle line\u00e6re LED-armaturer kan v\u00e6re en fordel, fordi de blokerer mindre af solindstr\u00e5lingen.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Interlighting\"><\/span>Interlighting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Til h\u00f8je afgr\u00f8der som tomat kan lys mellem planterne bruges som supplement til toplys. Det bringer fotoner t\u00e6ttere p\u00e5 de nederste blade, men kr\u00e6ver armaturer, der er robuste over for fugt og fysisk kontakt.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Varme_og_LED\"><\/span>Varme og LED<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>LED producerer mindre str\u00e5levarme mod planterne end traditionelle HPS-lamper, men den elektriske energi ender stadig som varme i drivhuset. Om vinteren kan varmen v\u00e6re nyttig, mens den om for\u00e5ret kan \u00f8ge ventilationsbehovet.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Luftfugtighed_og_kondens\"><\/span>Luftfugtighed og kondens<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>N\u00e5r grolyset forl\u00e6nger fotosyntesen, forts\u00e6tter planterne ogs\u00e5 med at transpirere. Hvis drivhuset er lukket om aftenen, kan luftfugtigheden stige. S\u00f8rg for luftskifte og eventuel varme, s\u00e5 kondens ikke bliver et kronisk problem.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Vanding_skal_foelge_lyset\"><\/span>Vanding skal f\u00f8lge lyset<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Mere lys giver typisk mere v\u00e6kst og st\u00f8rre vandforbrug. Hvis lysniveauet \u00f8ges markant uden at vandingen tilpasses, kan planterne f\u00e5 t\u00f8rkestress. Omvendt kan samme vandm\u00e6ngde p\u00e5 en m\u00f8rk dag give for v\u00e5d rodzone.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Daempning_efter_dagslys\"><\/span>D\u00e6mpning efter dagslys<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Den mest avancerede l\u00f8sning er dagslysintegreret styring, hvor LED-armaturerne d\u00e6mpes op og ned efter solindstr\u00e5lingen. P\u00e5 den m\u00e5de kan planten f\u00e5 en mere stabil lysm\u00e6ngde, samtidig med at str\u00f8mforbruget reduceres p\u00e5 lyse dage.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"IP-klasse_i_drivhus\"><\/span>IP-klasse i drivhus<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Drivhuse er fugtige og kan uds\u00e6tte armaturer for kondens og vandspr\u00f8jt. V\u00e6lg derfor armaturer med en IP-klasse, der passer til det konkrete milj\u00f8. Elektriske forbindelser og drivere skal ogs\u00e5 v\u00e6re beskyttede.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Korrosion\"><\/span>Korrosion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>H\u00f8j luftfugtighed, g\u00f8dning og kemiske dampe kan v\u00e6re h\u00e5rde ved metaller og elektronik. I professionelle drivhuse b\u00f8r materialevalg og overfladebehandling derfor indg\u00e5 i vurderingen.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Energioekonomi\"><\/span>Energi\u00f8konomi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Beregn ikke kun watt. Se p\u00e5 hvor meget fotosyntetisk lys armaturet leverer pr. watt, hvor godt det d\u00e6kker arealet, og hvor mange timer det realistisk skal k\u00f8re. Et effektivt armatur med god optik kan reducere b\u00e5de str\u00f8m og k\u00f8lebehov.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Planlaegning_foer_koeb\"><\/span>Planl\u00e6gning f\u00f8r k\u00f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Afgr\u00f8de<\/li>\n<li>Dyrkningsareal<\/li>\n<li>Eksisterende dagslys<\/li>\n<li>\u00d8nsket DLI<\/li>\n<li>Montageh\u00f8jde<\/li>\n<li>Skygge fra konstruktion<\/li>\n<li>IP-krav<\/li>\n<li>D\u00e6mpning og sensorstyring<\/li>\n<li>Ventilation og varme<\/li>\n<li>Elkapacitet<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Relaterede_guides_til_vaekstlys_og_dyrkning\"><\/span>Relaterede guides til v\u00e6kstlys og dyrkning<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vil du arbejde mere pr\u00e6cist med lysm\u00e6ngden, s\u00e5 l\u00e6s <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/hvor-mange-%c2%b5mol-skal-planter-have-for-at-trives\">guiden til \u00b5mol\/PPFD<\/a> og <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/hvor-meget-lys-har-mine-planter-brug-for\">hvor meget lys planter har brug for<\/a>. Til konkrete afgr\u00f8der findes ogs\u00e5 guider til <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/da-blog-led-vaekstlys-til-tomatplanter\">tomatplanter<\/a> og <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/blog-led-vaekstlys-til-chiliplanter\">chiliplanter<\/a>.<\/p>\n<p>Skal dyrkningen flyttes over i flere lag eller foreg\u00e5 helt indend\u00f8rs, s\u00e5 forts\u00e6t til <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/vertical-farming-lys-dyrkningssystem\">vertical farming \u2013 lys og dyrkningssystem<\/a>. Til den tidlige fase kan <a href=\"https:\/\/www.sunflux.dk\/da\/blog\/saabakker-minidrivhus-forspiring-guide\">guiden til s\u00e5bakker og forspiring<\/a> bruges som startpunkt.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Kan_grolys_erstatte_solen_i_drivhuset\"><\/span>Kan grolys erstatte solen i drivhuset?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ja i princippet, men i et drivhus bruges det ofte mere \u00f8konomisk som supplement til dagslyset.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Skal_grolys_vaere_taendt_hele_dagen\"><\/span>Skal grolys v\u00e6re t\u00e6ndt hele dagen?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ikke n\u00f8dvendigvis. Driftstiden b\u00f8r afh\u00e6nge af naturligt lys, afgr\u00f8de og \u00f8nsket DLI.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Hvor_taet_skal_grolys_haenge\"><\/span>Hvor t\u00e6t skal grolys h\u00e6nge?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Det afh\u00e6nger af armaturets effekt og optik. Brug producentens anbefaling og m\u00e5l gerne lysniveauet.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Er_4000K_almindelig_LED_nok\"><\/span>Er 4000K almindelig LED nok?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Planter kan bruge hvidt LED-lys, men et dedikeret v\u00e6kstlys har dokumenteret output og er lettere at dimensionere efter PPFD.<\/p>\n<p><strong>Faglig note:<\/strong> Til st\u00f8rre drivhuse b\u00f8r v\u00e6kstlyset dimensioneres ud fra m\u00e5lt dagslys, \u00f8nsket DLI og afgr\u00f8de. Det giver et bedre resultat end at v\u00e6lge lampen alene efter watt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Komplet guide til grolys i drivhus med PPFD, DLI, fotoperiode, placering, vinterlys, afgr\u00f8der, varme, fugt og valg af LED v\u00e6kstlys.<\/p>\n","protected":false},"author":1,"featured_media":23231,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ocean_front_end_style_editor":"no","ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[1579],"tags":[],"class_list":["post-23115","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vaekstbelysning","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails","has-product-nav"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/posts\/23115","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/comments?post=23115"}],"version-history":[{"count":0,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/posts\/23115\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/media\/23231"}],"wp:attachment":[{"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/media?parent=23115"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/categories?post=23115"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sunflux.dk\/da\/wp-json\/wp\/v2\/tags?post=23115"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}