{"id":1589,"date":"2016-10-05T09:20:03","date_gmt":"2016-10-05T09:20:03","guid":{"rendered":"http:\/\/infhub.com\/litetronix\/?page_id=1589"},"modified":"2018-03-27T20:41:00","modified_gmt":"2018-03-28T04:41:00","slug":"characteristics-of-led","status":"publish","type":"page","link":"https:\/\/litetronix.com.tw\/index.php\/technology\/characteristics-of-led\/","title":{"rendered":"Characteristics of LED"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"background-color: rgba(255,255,255,0);background-position: center center;background-repeat: no-repeat;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;margin-bottom: 0px;margin-top: 0px;border-width: 0px 0px 0px 0px;border-color:#545454;border-style:solid;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last fusion-column-no-min-height\" style=\"margin-top:0px;margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\" style=\"background-position:left top;background-repeat:no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover;padding: 0px 0px 0px 0px;\"><style type='text\/css'>.reading-box-container-1 .element-bottomshadow:before,.reading-box-container-1 .element-bottomshadow:after{opacity:0.7;}<\/style><div class=\"fusion-reading-box-container reading-box-container-1\" style=\"margin-top:0px;margin-bottom:0px;\"><div class=\"reading-box\" style=\"background-color:#ffffff;border-width:1px;border-color:#f6f6f6;border-top-width:3px;border-top-color:var(--primary_color);border-style:solid;\"><h2>Characteristics of LED<\/h2><div class=\"reading-box-additional fusion-reading-box-additional\">LEDs are solid-state devices. The advantages are:<\/p>\n<p style=\"padding-left: 30px;\">1) Light Generated by LED is Directional<\/p>\n<p style=\"padding-left: 60px;\">A. LED is all forward directional lighting, not Omni as conventional light bulb.<br \/>\nB. In general, beam angel is around 140 degree.<br \/>\nC. Utilize this directional characteristics and employee optical lens can achieve different light patterns.<\/p>\n<p style=\"padding-left: 30px;\">2) LED can Generate Different Light Color<\/p>\n<p style=\"padding-left: 60px;\">A. Wavelength determinate light color output: red, green, blue, yellow, or purple.<br \/>\nB. RGB light mix or different phosphor mix will create white light.<\/p>\n<p style=\"padding-left: 30px;\">3) Temperature will Affect LED Efficacy<\/p>\n<p style=\"padding-left: 60px;\">A. LED itself will generate heat, which will affect efficacy as well as LED life.<br \/>\nB. In general, 10 Degree increase will reduce 5 \u2013 7% lumen output<br \/>\nC. Maintain P-N Junction temperature under 75 degree will enable LED last for over 50,000 hours.<\/p>\n<p style=\"padding-left: 30px;\">4) Low Energy Consumption<\/p>\n<p style=\"padding-left: 60px;\">A. 100 lm\/W is commercialized, while over 200lm\/W is achieved in lab.<br \/>\nB. ILess than 1\/5 to 1\/10 power consumption of conventional lighting is achieving or 80% to 90% of energy will be saved.<\/p>\n<p style=\"padding-left: 30px;\">5) Long Life<\/p>\n<p style=\"padding-left: 60px;\">A. No fragile parts, as conventional light bulb, to be broken.<br \/>\nB. Light will decay lumen output, but rarely burn out or dead.<br \/>\nC. A well-designed luminaire expects over 70% lumen maintenance at 50,000 hours usage.<\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last fusion-column-no-min-height\" style=\"margin-top:0px;margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\" style=\"background-position:left top;background-repeat:no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover;padding: 0px 0px 0px 0px;\"><style type='text\/css'>.reading-box-container-2 .element-bottomshadow:before,.reading-box-container-2 .element-bottomshadow:after{opacity:0.7;}<\/style><div class=\"fusion-reading-box-container reading-box-container-2\" style=\"margin-top:30px;margin-bottom:30px;\"><div class=\"reading-box\" style=\"background-color:#f6f6f6;border-width:1px;border-color:#f6f6f6;border-top-width:3px;border-top-color:var(--primary_color);border-style:solid;\"><h2>LED Degradation and Failure: Junction temperature is the key parameter<\/h2><div class=\"reading-box-additional fusion-reading-box-additional\">Being solid-state devices, LEDs rarely burn out. Instead, the gradual degradation of light output, i.e. lumen depreciation, becomes the dominant failure mode of LEDs. The speed of lumen depreciation is closely relevant with the device\u2019s \u201cjunction temperature\u201d, which represents the temperature of the point where an individual diode connects to its substrate. Lower junction temperature leads to higher light output and slower lumen depreciation. Therefore, junction temperature is the key parameter for evaluating LED products\u2019 life span.<\/p>\n<p>The level of junction temperature is predominated by three factors, including drive current, thermal dissipation path and ambient temperature. In general, the higher the drive current, the greater the heat generated at the diode. As high-power LEDs are developed for general illumination application, the effectiveness of heat removal achieved by heat sink design becomes crucial in maintaining light output, life expectance and optical color.<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"margin-top:0px;margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\" style=\"background-position:left top;background-repeat:no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover;padding: 0px 0px 0px 0px;\"><div class=\"imageframe-align-center\"><div class=\"imageframe-liftup\"><span class=\" fusion-imageframe imageframe-dropshadow imageframe-1 fusion-animated\" style=\"border:1px solid #f2f2f2;-webkit-box-shadow: 3px 3px 7px rgba(0,0,0,0.3);box-shadow: 3px 3px 7px rgba(0,0,0,0.3);\" data-animationType=\"fadeInDown\" data-animationDuration=\"0.1\" data-animationOffset=\"100%\"><img width=\"300\" height=\"227\" title=\"lumen-maintenance\" src=\"https:\/\/litetronix.com.tw\/wp-content\/uploads\/2016\/10\/Lumen-Maintenance-300x227.png\" class=\"img-responsive wp-image-1599\" srcset=\"https:\/\/litetronix.com.tw\/wp-content\/uploads\/2016\/10\/Lumen-Maintenance-200x152.png 200w, https:\/\/litetronix.com.tw\/wp-content\/uploads\/2016\/10\/Lumen-Maintenance-400x303.png 400w, https:\/\/litetronix.com.tw\/wp-content\/uploads\/2016\/10\/Lumen-Maintenance-600x455.png 600w, https:\/\/litetronix.com.tw\/wp-content\/uploads\/2016\/10\/Lumen-Maintenance.png 703w\" sizes=\"(max-width: 1000px) 100vw, 300px\" \/><\/span><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last fusion-column-no-min-height\" style=\"margin-top:0px;margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\" style=\"background-position:left top;background-repeat:no-repeat;-webkit-background-size:cover;-moz-background-size:cover;-o-background-size:cover;background-size:cover;padding: 0px 0px 0px 0px;\"><style type='text\/css'>.reading-box-container-3 .element-bottomshadow:before,.reading-box-container-3 .element-bottomshadow:after{opacity:0.7;}<\/style><div class=\"fusion-reading-box-container reading-box-container-3\" style=\"margin-top:30px;margin-bottom:30px;\"><div class=\"reading-box\" style=\"background-color:#ffffff;border-width:1px;border-color:#f6f6f6;border-top-width:3px;border-top-color:var(--primary_color);border-style:solid;\"><div class=\"reading-box-additional\">To compare the durability of LEDs quantitatively, it is commonly referred to lumen maintenance, which represents how a lamp maintains its light output over its lifetime.LED products\u2019 life span.<\/p>\n<p>The level of junction temperature is predominated by three factors, including drive current, thermal dissipation path and ambient temperature. In general, the higher the drive current, the greater the heat generated at the diode. As high-power LEDs are developed for general illumination application, the effectiveness of heat removal achieved by heat sink design becomes crucial in maintaining light output, life expectance and optical color.<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><style type=\"text\/css\">.fusion-fullwidth.fusion-builder-row-1 { overflow:visible; }<\/style><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":2727,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Characteristics of LED - Litetronix Optotek Corp.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/litetronix.com.tw\/index.php\/technology\/characteristics-of-led\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Characteristics of LED - 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