{"id":1933,"date":"2014-07-24T16:15:00","date_gmt":"2014-07-24T20:15:00","guid":{"rendered":"https:\/\/sensing.konicaminolta.us\/blogs\/applying-the-proper-characterization-of-leds-with-average-led-intensity-ali"},"modified":"2022-09-06T12:48:10","modified_gmt":"2022-09-06T16:48:10","slug":"applying-the-proper-characterization-of-leds-with-average-led-intensity-ali","status":"publish","type":"blog","link":"https:\/\/sensing.konicaminolta.us\/us\/blog\/applying-the-proper-characterization-of-leds-with-average-led-intensity-ali\/","title":{"rendered":"Applying the Proper Characterization of LEDs with Average LED Intensity (ALI)"},"content":{"rendered":"<p>Luminous intensity measurements assume an object appears as a point source. For example laser diodes are microns in size and are point sources. However, white LEDs are large; about 1,000 times larger than laser diodes, more than 1 millimeter. To appear as a point source the white LED would need to be measured over longer distance i.e. meters. This increase in distance produces lower luminance intensities, which requires longer measurement times to compensate.<\/p>\n<p>LED manufactures need short measurement times to increase throughput. Thus, manufactures and CIE devised a new test condition named Averaged LED Intensity (ALI). ALI ensures that all manufactures measure at the same conditions and have a short measurement time. Results between manufactures can then be directly compared, even if the LED does not appear as a light source.<\/p>\n<p><strong>Concept of CIE 127:2007<\/strong><\/p>\n<p>\u201cCondition B\u201d is the most commonly used configuration. The LED is positioned 100mm from a round detector with an active area of 1 cm\u00b2.<\/p>\n<p><a href=\"\/us\/products\/led-4xx-luminous-intensity-adapter\/\">Instrument Systems LED-43X<\/a> series holds the LED at the correct position and precisely couples the light into a spectrometer like the <a href=\"\/us\/products\/cas-140ct\/\">CAS-140CTS<\/a> or SP320. Different mechanical adapters are available to allow alignment to a variety of LED handling machines.<\/p>\n<p>For higher precision measurements the <a href=\"https:\/\/sensing.konicaminolta.us\/us\/products\/led-25-averaged-led-intensity-adapter\/\">LED25-100<\/a> measures average LED intensity using a tiny 25mm integrating sphere inside.<\/p>\n<p><img decoding=\"async\" class=\"center-block\" src=\"\/wp-content\/uploads\/aligraph1-01385rie96.jpg\" width=\"522\" height=\"172\" \/><\/p>\n<p><strong>Figure 1<\/strong>: shows the LED-430 measuring adapter that conforms to the standard CIE condition B for 100 mm distance.<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/pictureone-27u038809r.png\" width=\"265\" height=\"165\" \/><img decoding=\"async\" src=\"\/wp-content\/uploads\/picturetwo-x88e38e207.png\" width=\"265\" height=\"165\" \/><img decoding=\"async\" src=\"\/wp-content\/uploads\/pictureone-1-1o9916j0cf.png\" width=\"265\" height=\"170\" \/><img decoding=\"async\" src=\"\/wp-content\/uploads\/pictureone-2-8d2b7u8nc6.png\" width=\"265\" height=\"165\" \/><\/p>\n","protected":false},"featured_media":845,"template":"","learning_center_categories":[241],"class_list":["post-1933","blog","type-blog","status-publish","has-post-thumbnail","hentry","learning_center_categories-light-display-measurement"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.4 (Yoast SEO v24.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Applying the Proper Characterization of LEDs with Average LED Intensity (ALI)<\/title>\r\n<meta name=\"description\" content=\"Averaged LED Intensity, or ALI, is a test condition devised to make sure all LED manufacturers measure at the same conditions and in a short amount of time.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" 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