{"id":62591,"date":"2023-11-14T10:48:23","date_gmt":"2023-11-14T10:48:23","guid":{"rendered":"https:\/\/knowhow.distrelec.com\/non-classifiee\/limportance-des-ultraviolets-dans-leclairage-horticole\/"},"modified":"2023-11-23T14:32:31","modified_gmt":"2023-11-23T14:32:31","slug":"limportance-des-ultraviolets-dans-leclairage-horticole","status":"publish","type":"post","link":"https:\/\/knowhow.distrelec.com\/fr\/energie-et-alimentation-electrique\/limportance-des-ultraviolets-dans-leclairage-horticole\/","title":{"rendered":"L&rsquo;importance des ultraviolets dans l&rsquo;\u00e9clairage horticole"},"content":{"rendered":"\n<div class=\"wp-block-columns has-border-color has-59-bacc-border-color has-gray-100-background-color has-background cnvs-block-core-columns-1679568406412 is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><div class=\"wp-block-image is-style-rounded\">\n<figure class=\"aligncenter size-large is-resized\"><img  loading=\"lazy\"  decoding=\"async\"  height=\"1024\"  width=\"768\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\"wp-image-46462 pk-lazyload\"  style=\"width:164px;height:218px\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 768px) 100vw, 768px\"  data-pk-src=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-768x1024.jpg\"  data-pk-srcset=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-768x1024.jpg 768w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-225x300.jpg 225w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-1152x1536.jpg 1152w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-1536x2048.jpg 1536w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-380x507.jpg 380w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-550x733.jpg 550w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-800x1067.jpg 800w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-1160x1547.jpg 1160w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/03\/James-profile-scaled.jpg 1440w\" ><\/figure><\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p>James Prietzel, chef de produit chez <a href=\"https:\/\/www.distrelec.fr\/fr\/manufacturer\/intelligent-led-solutions\/man_ils?queryFromSuggest=true\" target=\"_blank\" rel=\"noreferrer noopener\">Intelligent LED Solutions<\/a> (ILS)<\/p>\n\n\n\n<p>James occupe le poste de chef de produit pour tout ce qui concerne les LED au sein d&rsquo;ILS et fait partie de l&rsquo;\u00e9quipe depuis 2012. Il se concentre sur les derni\u00e8res technologies et innovations des principaux fournisseurs du monde de l&rsquo;opto\u00e9lectronique, y compris l&rsquo;optique, les LED et les drivers de LED intelligents.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p>Les LED ont \u00e9t\u00e9 \u00e0 l&rsquo;origine de progr\u00e8s r\u00e9volutionnaires dans de nombreux domaines de la technologie et de la vie, mais aucun n&rsquo;est aussi crucial que dans le domaine de l&rsquo;horticulture. La complexit\u00e9 et les exigences en mati\u00e8re de connaissances augmentent de jour en jour, avec chaque plante n\u00e9cessitant un \u00e9clairage spectral et un niveau de contr\u00f4le sp\u00e9cifique.<\/p>\n\n\n\n<p>Cet article explore les applications de l&rsquo;\u00e9clairage LED ultraviolet (UV) dans le domaine de l&rsquo;horticulture, mettant en lumi\u00e8re ses avantages et les domaines o\u00f9 il peut \u00eatre appliqu\u00e9 dans le processus de culture. Nous examinerons en d\u00e9tail les multiples fa\u00e7ons dont les ultraviolets peuvent b\u00e9n\u00e9ficier au march\u00e9 horticole. De plus, nous expliquerons comment la lumi\u00e8re UV peut contribuer au bien-\u00eatre de la faune, notamment des abeilles et des gu\u00eapes, tout au long du processus de croissance, am\u00e9liorant ainsi le potentiel de d\u00e9veloppement.<\/p>\n\n\n\n<h2 id=\"quest-ce-que-lultraviolet\" class=\"wp-block-heading\">Qu&rsquo;est-ce que l&rsquo;ultraviolet ?<\/h2>\n\n\n\n<p>L&rsquo;ultraviolet est un rayonnement \u00e0 la fois du spectre visible et non visible. \u00c0 mesure que la longueur d&rsquo;onde diminue, il devient moins visible et plus nocif. Il existe trois types de rayonnements ultraviolets, class\u00e9s en fonction de leur longueur d&rsquo;onde.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img  loading=\"lazy\"  decoding=\"async\"  width=\"636\"  height=\"353\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\"wp-image-61550 pk-lazyload\"  style=\"aspect-ratio:1.7964071856287425;width:458px;height:auto\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 636px) 100vw, 636px\"  data-pk-src=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-3.png\"  data-pk-srcset=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-3.png 636w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-3.png?resize=300,167 300w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-3.png?resize=380,211 380w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-3.png?resize=550,305 550w\" ><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Rayonnement UV-A (315 \u00e0 420 nm). <\/strong>\u00c0 peine visibles par l&rsquo;\u0153il humain, les UV-A ont la plus grande longueur d&rsquo;onde, pr\u00e9sentant ainsi le moindre risque pour l&rsquo;\u0153il humain tout en \u00e9tant les plus efficaces. La majeure partie du rayonnement UV-A \u00e9mis par le soleil traverse la couche d&rsquo;ozone, en faisant ainsi la forme d&rsquo;ultraviolet la plus abondante.<strong><\/strong><\/li>\n\n\n\n<li><strong>Rayonnement UV-B (280nm \u00e0 315nm).<\/strong> Principalement utilis\u00e9 pour la st\u00e9rilisation et la d\u00e9contamination de l&rsquo;eau, le rayonnement UV-B assure que les moisissures et les spores ne se d\u00e9veloppent pas sur les plantes. Pour y parvenir, il est n\u00e9cessaire de r\u00e9duire la pr\u00e9sence de bact\u00e9ries dans l&rsquo;eau, auxquelles les moisissures et les spores ont g\u00e9n\u00e9ralement tendance \u00e0 s&rsquo;attacher et \u00e0 partir desquelles elles se d\u00e9veloppent.<strong><\/strong><\/li>\n\n\n\n<li><strong>Rayonnement UV-C (g\u00e9n\u00e9ralement inf\u00e9rieur \u00e0 280 nm). <\/strong>Ces longueurs d&rsquo;onde sont g\u00e9n\u00e9ralement filtr\u00e9es par la couche d&rsquo;ozone et ne sont donc pas pr\u00e9sentes dans la lumi\u00e8re du soleil. Cependant, \u00e0 des doses appropri\u00e9es, les UV-C peuvent effectivement stimuler la croissance des plantes. Cette longueur d&rsquo;onde permet de restreindre ou d&rsquo;\u00e9liminer les pesticides et les moisissures pr\u00e9sents pendant la croissance de la plante, favorisant ainsi son \u00e9panouissement dans des conditions de croissance optimales.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"pourquoi-les-plantes-ont-elles-besoin-de-lumiere-ultraviolette\" class=\"wp-block-heading\">Pourquoi les plantes ont-elles besoin de lumi\u00e8re ultraviolette ?<\/h2>\n\n\n\n<p>La lumi\u00e8re ultraviolette joue un r\u00f4le extr\u00eamement important dans la croissance des plantes. \u00c0 des doses mod\u00e9r\u00e9es, la lumi\u00e8re ultraviolette aide les plantes et les cultures \u00e0 produire des huiles v\u00e9g\u00e9tales essentielles. Ces substances ne se contentent pas d&rsquo;am\u00e9liorer la saveur et l&rsquo;odeur des fruits, mais elles aident \u00e9galement les plantes \u00e0 se prot\u00e9ger contre une exposition excessive aux ultraviolets, agissant comme leur propre \u00e9cran solaire naturel.<\/p>\n\n\n\n<p>Cette protection naturelle contribue \u00e0 pr\u00e9server les processus internes de la plante, assurant ainsi des conditions de croissance optimales. \u00c0 cet \u00e9gard, les plantes d\u00e9montrent une grande intelligence : elles n&rsquo;absorbent que le niveau d&rsquo;ultraviolets n\u00e9cessaire pour d\u00e9clencher ce processus d&rsquo;autoprotection, et rien de plus.<\/p>\n\n\n\n<p>Les ultraviolets se trouvent en dehors de la plage d&rsquo;ondes photosynth\u00e9tiquement actives (PAR &#8211; l&rsquo;\u00e9nergie totale n\u00e9cessaire \u00e0 une plante, de 400 \u00e0 700 nm), mais ils sont biologiquement actifs et r\u00e9gulent la croissance des plantes. Les effets positifs des ultraviolets sur les cultures comprennent : <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inhibition de la croissance en hauteur (tiges plus courtes et feuilles plus petites)<\/li>\n\n\n\n<li>Augmentation de l&rsquo;\u00e9paisseur des feuilles et de leur aspect cireux (cuticules plus \u00e9paisses)<\/li>\n\n\n\n<li>Une plus grande coloration des feuilles, particuli\u00e8rement notable chez les plantes \u00e0 feuilles violac\u00e9es telles que la laitue \u00e0 feuilles rouges, le millet violet et l&rsquo;herbe \u00e0 la fontaine violette.<\/li>\n<\/ul>\n\n\n\n<p>Des recherches ont \u00e9galement d\u00e9montr\u00e9 que les plantes expos\u00e9es aux rayons ultraviolets ont tendance \u00e0 \u00eatre moins attaqu\u00e9es par les parasites, \u00e0 \u00eatre davantage pollinis\u00e9es et \u00e0 pr\u00e9senter un rendement global plus \u00e9lev\u00e9.<\/p>\n\n\n\n<p>L&rsquo;int\u00e9gration d&rsquo;UV-C dans les lampes de culture horticole \u00e0 LED permet aux plantes de cro\u00eetre en hauteur. Cependant, il est imp\u00e9ratif d&rsquo;exercer une grande prudence avec les UV-C, car un surdosage peut g\u00e9n\u00e9ralement entra\u00eener un retard de croissance chez la plante. Il est recommand\u00e9 de ne pas d\u00e9passer 15 minutes par semaine d&rsquo;exposition aux UV-C. Ce traitement est conseill\u00e9 pour toutes les plantes, y compris les arbres.<\/p>\n\n\n\n<h2 id=\"quels-sont-les-avantages-individuels-des-uva-uvb-et-uvc-dans-lhorticulture\" class=\"wp-block-heading\">Quels sont les avantages individuels des UVA, UVB et UVC dans l&rsquo;horticulture ?<\/h2>\n\n\n\n<p>L&rsquo;exploitation de longueurs d&rsquo;onde UV sp\u00e9cifiques propose une solution d&rsquo;\u00e9clairage optimale et \u00e9conome en \u00e9nergie par rapport aux autres options actuellement disponibles sur le march\u00e9. L&rsquo;int\u00e9gration de LED ultraviolettes dans l&rsquo;environnement de culture permet une reproduction plus fid\u00e8le de la lumi\u00e8re du jour et prolonge les heures de culture. Cela s&rsquo;applique aussi bien aux environnements avec lumi\u00e8re du soleil qu&rsquo;\u00e0 ceux sans lumi\u00e8re naturelle.<\/p>\n\n\n\n<p>Les UV-A repr\u00e9sentent la longueur d&rsquo;onde la plus fr\u00e9quemment pr\u00e9sente dans la lumi\u00e8re solaire filtr\u00e9e ou le spectre complet. Int\u00e9grer cette longueur d&rsquo;onde dans votre spectre am\u00e9liorera l&rsquo;efficacit\u00e9 de la photosynth\u00e8se de la plante, en ciblant sp\u00e9cifiquement les r\u00e9gions de la chlorophylle A et B qui absorbent la plus grande quantit\u00e9 de lumi\u00e8re dans la plage de 400 nm \u00e0 460 nm. Lorsqu&rsquo;il est utilis\u00e9 en conjonction avec les longueurs d&rsquo;onde du rouge lointain (720 &#8211; 740 nm), cela accro\u00eet consid\u00e9rablement l&rsquo;absorption de la lumi\u00e8re n\u00e9cessaire \u00e0 la photosynth\u00e8se.<\/p>\n\n\n\n<p>Un autre avantage de l&rsquo;utilisation des UV-A dans la croissance des plantes est li\u00e9 \u00e0 la diff\u00e9rence de perception de la lumi\u00e8re par l&rsquo;abeille par rapport \u00e0 l&rsquo;\u0153il humain, comme expliqu\u00e9 plus en d\u00e9tail ci-dessous. L&rsquo;int\u00e9gration des UV-A am\u00e9liore ainsi l&rsquo;environnement de culture et facilite la pollinisation par les abeilles.<\/p>\n\n\n\n<p>Les UV-C, et dans une moindre mesure les UV-B, sont employ\u00e9s pour d\u00e9contaminer l&rsquo;eau et les surfaces, car ils \u00e9liminent pratiquement tous les micro-organismes lorsqu&rsquo;ils sont concentr\u00e9s. Ces longueurs d&rsquo;onde \u00e0 haute \u00e9nergie pourraient \u00e9galement \u00eatre appliqu\u00e9es aux plantes pour \u00e9liminer les agents pathog\u00e8nes susceptibles de r\u00e9sider sur les feuilles. De plus, les insectes utilisent les ultraviolets pour se diriger vers les fleurs. En l&rsquo;absence totale de lumi\u00e8re ultraviolette \u00e0 l&rsquo;int\u00e9rieur d&rsquo;une serre, les pollinisateurs peuvent \u00e9prouver des difficult\u00e9s \u00e0 rep\u00e9rer les fleurs.<\/p>\n\n\n\n<p>Il est imp\u00e9ratif de prendre en consid\u00e9ration le caract\u00e8re nocif de tous les \u00e9l\u00e9ments de l&rsquo;ultraviolet (UV-A, UV-B et UV-C) pour l&rsquo;homme, et des pr\u00e9cautions n\u00e9cessaires doivent \u00eatre prises lorsqu&rsquo;on travaille dans un environnement utilisant l&rsquo;\u00e9clairage LED UV. Les travailleurs ne doivent pas regarder directement la lumi\u00e8re, et l&rsquo;utilisation d&rsquo;un syst\u00e8me optique appropri\u00e9 est essentielle pendant le fonctionnement. Il est fortement recommand\u00e9 de porter des lunettes de protection en tout temps pendant le fonctionnement.<\/p>\n\n\n\n<h2 id=\"la-lumiere-ultraviolette-est-elle-importante-pour-la-pollinisation\" class=\"wp-block-heading\">La lumi\u00e8re ultraviolette est-elle importante pour la pollinisation ?<\/h2>\n\n\n\n<p>L&rsquo;un des aspects les plus \u00e9tonnants de la lumi\u00e8re ultraviolette est son importance cruciale pour les abeilles, qui l&rsquo;utilisent comme point de r\u00e9f\u00e9rence lors de la pollinisation. Selon une r\u00e9cente \u00e9tude men\u00e9e par le D\u00e9partement de l&rsquo;Agriculture des \u00c9tats-Unis (USDA), les abeilles sont responsables d&rsquo;environ 80 % de la pollinisation. En l&rsquo;absence d&rsquo;ultraviolets, elles \u00e9prouvent g\u00e9n\u00e9ralement des difficult\u00e9s \u00e0 localiser les plantes \u00e0 polliniser et risquent de mourir avant d&rsquo;avoir accompli cette t\u00e2che vitale.<\/p>\n\n\n\n<p>Les ultraviolets jouent un r\u00f4le essentiel dans ce processus. Le fonctionnement des r\u00e9cepteurs des abeilles diff\u00e8re consid\u00e9rablement de celui de l&rsquo;\u0153il humain. Alors que l&rsquo;\u0153il humain est plus sensible \u00e0 la partie verte du spectre, les abeilles, quant \u00e0 elles, r\u00e9v\u00e8lent une plus grande sensibilit\u00e9 aux ultraviolets non visibles du spectre. Ainsi, les ultraviolets am\u00e9liorent la visibilit\u00e9 du pollen pour les r\u00e9cepteurs des abeilles, qui le consid\u00e8rent comme un point d&rsquo;int\u00e9r\u00eat \u00e0 cibler.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img  loading=\"lazy\"  decoding=\"async\"  width=\"622\"  height=\"299\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\"wp-image-61567 pk-lazyload\"  style=\"aspect-ratio:2.080267558528428;width:689px;height:auto\"  data-pk-sizes=\"auto\"  data-ls-sizes=\"auto, (max-width: 622px) 100vw, 622px\"  data-pk-src=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-4.png\"  data-pk-srcset=\"https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-4.png 622w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-4.png?resize=300,144 300w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-4.png?resize=380,183 380w, https:\/\/knowhow.distrelec.com\/wp-content\/uploads\/2023\/10\/image-4.png?resize=550,264 550w\" ><\/figure><\/div>\n\n\n<p>Une autre raison pour laquelle les UV sont cruciaux pour la pollinisation est que les abeilles peuvent percevoir en trois dimensions, am\u00e9liorant ainsi leur capacit\u00e9 \u00e0 \u00e9valuer la profondeur, la distance et \u00e0 voir toute la circonf\u00e9rence d&rsquo;un objet. Contrairement aux yeux humains, qui ont tendance \u00e0 percevoir en deux dimensions, limitant notre vision \u00e0 l&rsquo;avant d&rsquo;un objet sans visualiser l&rsquo;arri\u00e8re. En l&rsquo;absence de la longueur d&rsquo;onde ultraviolette, les r\u00e9cepteurs des abeilles n&rsquo;auraient tout simplement pas de point de r\u00e9f\u00e9rence, compliquant consid\u00e9rablement le processus de pollinisation.<\/p>\n\n\n\n<p>Pour toute demande de renseignements ou d&rsquo;informations compl\u00e9mentaires, veuillez contacter le +44 (0) 1635 294606 ou envoyer un e-mail \u00e0 l&rsquo;adresse <a href=\"mailto:info@i-hled.co.uk?subject=IHS%20Enquiry%20-%20UV%20in%20Horticulture%20Article\" target=\"_blank\" rel=\"noreferrer noopener\">info@i-hled.co.uk<\/a> Vous pouvez \u00e9galement consulter notre site web <a href=\"https:\/\/www.i-hled.co.uk\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.i-hled.co.uk\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"James Prietzel, chef de produit chez Intelligent LED Solutions (ILS) James occupe le poste de chef de produit&hellip;\n","protected":false},"author":29,"featured_media":61609,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"","csco_page_header_type":"","csco_appearance_grid":"","csco_page_load_nextpost":"","csco_post_video_location":[],"csco_post_video_location_hash":"","csco_post_video_url":"","csco_post_video_bg_start_time":0,"csco_post_video_bg_end_time":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[181,182],"tags":[],"coauthors":[1744],"class_list":{"0":"post-62591","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-electronique","8":"category-energie-et-alimentation-electrique","9":"cs-entry","10":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - 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