{"id":2183,"date":"2017-08-25T20:02:18","date_gmt":"2017-08-26T00:02:18","guid":{"rendered":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/?p=2183"},"modified":"2018-06-01T14:49:50","modified_gmt":"2018-06-01T18:49:50","slug":"energy-efficient-lighting-strategies-for-vertical-or-indoor-farms","status":"publish","type":"post","link":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/energy-efficient-lighting-strategies-for-vertical-or-indoor-farms\/","title":{"rendered":"Energy efficient lighting strategies"},"content":{"rendered":"<p>A question many growers are asking is whether vertical farming of hydroponic lettuce production is profitable. Light requirement (daily light integral, DLI) of lettuce can vary from 15-20 mol\/m2\/day. Lettuce grown under low DLI has slow growth rate (i.e., takes longer to harvest) and appear poor in quality (elongated).\u00a0 Current estimate is that energy costs for lighting alone can be 40 to 50% of return from sale of lettuce, making it challenging to make profits.\u00a0 The sustainability of vertical farms will mainly depend on developing research based solutions for decreasing energy costs.\u00a0 In our lab, we are testing different lighting systems, mostly LEDs, for their efficiencies, energy costs and effect on plant growth.\u00a0 We are also building biofeedback systems that reduce overall energy (for lighting) consumption in vertical or indoor farms.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-2153\" src=\"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study.jpg\" alt=\"\" width=\"844\" height=\"1126\" srcset=\"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study.jpg 844w, https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study-225x300.jpg 225w, https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study-768x1024.jpg 768w, https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study-200x268.jpg 200w, https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-content\/uploads\/sites\/15\/2016\/12\/LED-study-97x130.jpg 97w\" sizes=\"auto, (max-width: 844px) 100vw, 844px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A question many growers are asking is whether vertical farming of hydroponic lettuce production is profitable. Light requirement (daily light integral, DLI) of lettuce can vary from 15-20 mol\/m2\/day. Lettuce grown under low DLI has slow growth rate (i.e., takes longer to harvest) and appear poor in quality (elongated).\u00a0 Current estimate is that energy costs&#8230;<span id=\"post-label-2183\" class=\"sr-only\">Read more about Energy efficient lighting strategies<\/span><a class=\"read-more\" href=\"https:\/\/www.purdue.edu\/hla\/sites\/cea\/energy-efficient-lighting-strategies-for-vertical-or-indoor-farms\/\" aria-labelledby=\"post-label-2183\">[Read More]<\/a><\/p>\n","protected":false},"author":136,"featured_media":2153,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"issuem_issue_categories":[],"issuem_issue_tags":[],"coauthors":[44],"class_list":["post-2183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/posts\/2183","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/users\/136"}],"replies":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/comments?post=2183"}],"version-history":[{"count":4,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/posts\/2183\/revisions"}],"predecessor-version":[{"id":2301,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/posts\/2183\/revisions\/2301"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/media\/2153"}],"wp:attachment":[{"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/media?parent=2183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/categories?post=2183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/tags?post=2183"},{"taxonomy":"issuem_issue_categories","embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/issuem_issue_categories?post=2183"},{"taxonomy":"issuem_issue_tags","embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/issuem_issue_tags?post=2183"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.purdue.edu\/hla\/sites\/cea\/wp-json\/wp\/v2\/coauthors?post=2183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}