{"id":6999,"date":"2023-06-17T09:38:51","date_gmt":"2023-06-17T13:38:51","guid":{"rendered":"http:\/\/marktechopto.flywheelsites.com\/?p=6999"},"modified":"2026-07-31T17:02:14","modified_gmt":"2026-07-31T21:02:14","slug":"lifetime-and-reliability-of-leds","status":"publish","type":"post","link":"https:\/\/optrans.com\/ja\/led%E3%81%AE%E5%AF%BF%E5%91%BD%E3%81%A8%E4%BF%A1%E9%A0%BC%E6%80%A7\/","title":{"rendered":"LED\u306e\u5bff\u547d\u3068\u4fe1\u983c\u6027"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6999\" class=\"elementor elementor-6999\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-421edd8 e-con-full e-flex e-con e-parent\" data-id=\"421edd8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7b93d31 elementor-widget elementor-widget-image\" data-id=\"7b93d31\" data-element_type=\"widget\" data-e-type=\"widget\" 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data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">LED\u306e\u96fb\u6d41\u6761\u4ef6<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1262373 elementor-widget elementor-widget-text-editor\" data-id=\"1262373\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div 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elementor-widget-text-editor\" data-id=\"cc5bba3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u632f\u52d5\u3001\u885d\u6483\u3001\u30ac\u30b9\u3001\u7d2b\u5916\u7dda\u306a\u3069\u306e\u8981\u56e0\u304c\u30ea\u30fc\u30c9\u3084\u6a39\u8102\u306b\u5f71\u97ff\u3059\u308b\u6761\u4ef6\u3067LED\u3092\u4f7f\u3046\u5834\u5408\u3001\u30aa\u30d7\u30c8\u30e9\u30f3\u30b9\u3067\u306f\u3001\u5f71\u97ff\u3057\u3046\u308b\u8981\u56e0\u3054\u3068\u306bLED\u3092\u500b\u5225\u306b\u8a66\u9a13\u3059\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-47b6deb elementor-widget elementor-widget-heading\" data-id=\"47b6deb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">LED\u306e\u65ad\u7dda\u30e2\u30fc\u30c9<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6557537 elementor-widget elementor-widget-text-editor\" data-id=\"6557537\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div 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class=\"elementor-element elementor-element-8ccbc38 elementor-widget elementor-widget-heading\" data-id=\"8ccbc38\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">LED\u30e9\u30f3\u30d7\u306e\u6e29\u5ea6\u30b5\u30a4\u30af\u30eb\u8a66\u9a13<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4cfbbea elementor-widget elementor-widget-text-editor\" data-id=\"4cfbbea\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div 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data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>LED\u30e9\u30f3\u30d7\u306f\u3001\u306f\u3093\u3060\u4ed8\u3051\u306b\u3088\u3063\u3066\u6a5f\u5668\u306b\u7d44\u307f\u8fbc\u307e\u308c\u307e\u3059\u3002\u6a5f\u5668\u306b\u306f\u3093\u3060\u4ed8\u3051\u3057\u305fLED\u306e\u4fe1\u983c\u6027\u306f\u3001\u6a5f\u5668\u306b\u7d44\u307f\u8fbc\u3093\u3067\u3044\u306a\u3044\u5358\u4f53\u306eLED\u306e\u6e29\u5ea6\u30b5\u30a4\u30af\u30eb\u8a66\u9a13\u306e\u7d50\u679c\u304b\u3089\u306f\u63a8\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30aa\u30d7\u30c8\u30e9\u30f3\u30b9\u3067\u306f\u3001\u3059\u3067\u306b\u6a5f\u5668\u306b\u306f\u3093\u3060\u4ed8\u3051\u3057\u305fLED\u306b\u3064\u3044\u3066\u3001\u6e29\u5ea6\u30b5\u30a4\u30af\u30eb\u8a66\u9a13\u3068\u4fe1\u983c\u6027\u8a66\u9a13\u3092\u884c\u3046\u3053\u3068\u3092\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8cd9a45 elementor-widget elementor-widget-heading\" data-id=\"8cd9a45\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\u5bff\u547d\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0724db elementor-widget elementor-widget-text-editor\" data-id=\"d0724db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u73fe\u5728\u4f7f\u308f\u308c\u3066\u3044\u308bLED\u30e9\u30f3\u30d7\u306e\u5bff\u547d\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u624b\u6cd5\u3067\u306f\u3001\u5bff\u547d\u3068\u3001\u5b9f\u969b\u306e\u7528\u9014\u3067\u5149\u5ea6\u304c\u52a3\u5316\u3059\u308b\u50be\u5411\u3068\u306e\u76f8\u95a2\u3092\u78ba\u7acb\u3067\u304d\u3066\u3044\u307e\u305b\u3093\u3002\u3055\u3089\u306b\u3001\u6a5f\u5668\u306b\u7d44\u307f\u8fbc\u3093\u3067\u3044\u306a\u3044\u5358\u4f53\u306eLED\u30e9\u30f3\u30d7\u306e\u5468\u56f2\u6e29\u5ea6\u3068\u3001\u6a5f\u5668\u306b\u7d44\u307f\u8fbc\u3093\u3060LED\u30e9\u30f3\u30d7\u306e\u5468\u56f2\u6e29\u5ea6\u304c\u7570\u306a\u308b\u3068\u3044\u3046\u554f\u984c\u3082\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u306f\u3001\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u3053\u306e\u3088\u3046\u306a\u60c5\u5831\u3092\u5f97\u308b\u65b9\u6cd5\u3092\u793a\u3057\u305f\u3082\u306e\u3067\u3059\u3002\u8aac\u660e\u3092\u7c21\u5358\u306b\u3059\u308b\u305f\u3081\u3001\u4eee\u60f3\u306eLED\u30e9\u30f3\u30d7\u306e\u7279\u6027\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\u4f8b\uff08a\uff09\uff1a\u9ad8\u6e29\u306e\u6a5f\u5668\u304c\u7a3c\u50cd\u3057\u3066\u3044\u308b\u90e8\u5c4b\u306b\u8a2d\u7f6e\u3055\u308c\u305f\u5236\u5fa1\u6a5f\u5668\u306b\u7d44\u307f\u8fbc\u3093\u3060LED\u30e9\u30f3\u30d7\u306e\u5bff\u547d\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1fcb46b elementor-widget elementor-widget-heading\" data-id=\"1fcb46b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">\u74b0\u5883<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0f15713 elementor-widget elementor-widget-text-editor\" data-id=\"0f15713\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u9ad8\u6e29\u306e\u6a5f\u5668\u306f\u3001\u9806\u65b9\u5411\u96fb\u6d4120mA\u3067\u5e74\u95931,080\u6642\u9593\uff081\u65e53\u6642\u9593\u00d7360\u65e5\uff09\u7a3c\u50cd\u3059\u308b<\/p><p>LED\u30e9\u30f3\u30d7\u306e\u5468\u56f2\u6e29\u5ea6\u306f\u5e74\u959360\u65e5\u304c60\u00b0C\u3001\u6e7f\u5ea690%<br \/>LED\u30e9\u30f3\u30d7\u306e\u5468\u56f2\u6e29\u5ea6\u306f\u5e74\u959390\u65e5\u304c40\u00b0C\u3001\u6e7f\u5ea690%<br \/>LED\u30e9\u30f3\u30d7\u306e\u5468\u56f2\u6e29\u5ea6\u306f\u5e74\u9593210\u65e5\u304c25\u00b0C\u3001\u6e7f\u5ea690%<br \/>LED\u30e9\u30f3\u30d7\u306e\u5bff\u547d\u7279\u6027\uff1a\u56f317\u306bLED\u30e9\u30f3\u30d7\u306e\u5bff\u547d\u7279\u6027\u3092\u793a\u3057\u307e\u3059\u3002<br \/>\u76f8\u5bfe\u5149\u5ea6\u3068\u6642\u9593\u306e\u95a2\u4fc2<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74ee8b0 elementor-widget elementor-widget-text-editor\" data-id=\"74ee8b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u5468\u56f2\u6e29\u5ea6\u5225\u306eLED\u30e9\u30f3\u30d7\u5e74\u9593\u52d5\u4f5c\u6642\u9593\u306e\u7b97\u51fa<\/p>\n<p>\u6761\u4ef61\u306e\u52d5\u4f5c\u6642\u9593\uff1a3\u6642\u9593 x 60\u65e5 = 180\u6642\u9593<br>\u6761\u4ef62\u306e\u52d5\u4f5c\u6642\u9593\uff1a3\u6642\u9593 x 90\u65e5 = 270\u6642\u9593<br>\u6761\u4ef63\u306e\u52d5\u4f5c\u6642\u9593\uff1a3\u6642\u9593 x 210\u65e5 = 630\u6642\u9593<\/p>\n<p>\u4e0a\u8a18\u306e\u7a3c\u50cd\u7387\u3092\u7528\u3044\u3066\u3001\u56f317\u306e\u52a3\u5316\u7279\u6027\u3092\u5404\u5468\u56f2\u6e29\u5ea6\u306b\u5f53\u3066\u306f\u3081\u307e\u3057\u305f\u3002<\/p>\n<p>\u7d50\u679c\u3092\u56f318\u306b\u793a\u3057\u307e\u3059\u3002\u3053\u306e\u4f8b\u3067\u306f\u3001\u5bff\u547d\u7279\u6027\u3092\u8fd1\u4f3c\u5f0fexp(-\u03bbt)\u3067\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3057\u3066\u304a\u308a\u3001\u03bb\u306f\u305d\u306e\u3064\u3069\u5909\u308f\u308a\u307e\u3059\u3002\u56f317\u306e\u7279\u6027\u306e\u66f2\u7dda\u306e\u6642\u5b9a\u6570\u3092\u03bb1\u3001\u03bb2\u3001\u03bb3\u3068\u3057\u3001\u5149\u5ea6\u306e\u4f4e\u4e0b\u7387\uff1dexp(-\u03bbnt)\u3068\u3057\u3066\u3001\u5404\u7a3c\u50cd\u6642\u9593\u306b\u03bb\u3092\u5272\u308a\u5f53\u3066\u3066\u8a08\u7b97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6ce8\uff1a\u3055\u307e\u3056\u307e\u306a\u5bff\u547d\u7279\u6027\u3092\u3059\u3079\u30661\u3064\u306e\u8fd1\u4f3c\u5f0f\u3067\u8868\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u30021\u65e5\u306e\u7a3c\u50cd\u6642\u9593\u304c\u77ed\u3044\u5834\u5408\u3067\u3082\u3001\u4e0a\u8a18\u306e\u4f8b\u3092\u3082\u3068\u306b10\u5e74\u300120\u5e74\u5148\u307e\u3067\u7279\u6027\u3092\u5916\u633f\u3057\u3001\u305d\u306e\u7d50\u679c\u304c\u6b63\u78ba\u3060\u3068\u671f\u5f85\u3059\u308b\u306e\u306f\u5371\u967a\u3067\u3059\u3002\u76f8\u5bfe\u5149\u5ea6\u6b8b\u5b58\u7387\u3068\u6642\u9593\u306e\u95a2\u4fc2 1<\/p>\n<p align=\"center\"><img decoding=\"async\" class=\"alignnone size-full wp-image-10669\" src=\"https:\/\/optrans.com\/wp-content\/uploads\/2026\/05\/LuminosityResidueVTime1.jpg\" alt=\"\" width=\"240\" height=\"142\"><\/p>\n<p align=\"center\">\u56f318\uff1a\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u4f8b<\/p>\n<p>\u6700\u8fd1\u306e\u6539\u826f\u306b\u3088\u308a\u3001LED\u30e9\u30f3\u30d7\u306e\u5149\u5ea6\u304c\u4f7f\u7528\u3068\u3068\u3082\u306b\u4f4e\u4e0b\u3059\u308b\u50be\u5411\u306f\u5c0f\u3055\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u5bff\u547d\u7279\u6027\u306e\u9577\u671f\u8a66\u9a13\u306e\u7d50\u679c\u304b\u3089\u3001\u73fe\u5728\u3067\u306f\u5149\u5ea6\u304c\u5fc5\u305a\u3057\u3082\u6e1b\u8870\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u307e\u3059\u3002\u4f7f\u7528\u4e2d\u306b\u8d77\u3053\u308b\u5149\u5ea6\u306e\u4f4e\u4e0b\u306f\u3001\u30ef\u30a4\u30d6\u30eb\u5206\u5e03\u95a2\u6570\u3092\u4f7f\u3063\u3066\u8a55\u4fa1\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6570\u5343\u6642\u9593\u306e\u5bff\u547d\u8a66\u9a13\u3092\u884c\u3063\u3066\u3082\u3001M\u5024\u304c\u5909\u5316\u3057\u306a\u3044\u5834\u5408\u3082\u3042\u308a\u307e\u3059\uff08\u56f319\u53c2\u7167\uff09\u3002<\/p>\n<p>\u76f8\u5bfe\u5149\u5ea6\u6b8b\u5b58\u7387\u3068\u6642\u9593\u306e\u95a2\u4fc2 2<\/p>\n<p align=\"center\"><img decoding=\"async\" class=\"alignnone size-full wp-image-10670\" src=\"https:\/\/optrans.com\/wp-content\/uploads\/2026\/05\/LuminosityResidueVTime2.jpg\" alt=\"\" width=\"501\" height=\"264\" srcset=\"https:\/\/optrans.com\/wp-content\/uploads\/2026\/05\/LuminosityResidueVTime2.jpg 501w, https:\/\/optrans.com\/wp-content\/uploads\/2026\/05\/LuminosityResidueVTime2-300x158.jpg 300w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/p>\n<p align=\"center\">\u56f319\uff1a\u5bff\u547d\u8a66\u9a13\u306e\u7d50\u679c\u304b\u3089\u306e\u4e88\u6e2c\uff08a\uff09\u3001\uff08b\uff09\u3001\uff08c\uff09<\/p>\n<p>\u56f319\u306e\uff08a\uff09\u3068\uff08b\uff09\u3067\u306f\u3001\u9577\u671f\u306e\u5bff\u547d\u8a66\u9a13\u306e\u7d50\u679c\u304b\u3089\u3059\u3067\u306b\u5149\u5ea6\u306e\u52a3\u5316\u50be\u5411\u304c\u78ba\u8a8d\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u6bd4\u8f03\u7684\u5bb9\u6613\u306b\u5bff\u547d\u3092\u4e88\u6e2c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u56f319\u306e\uff08c\uff09\u3067\u306f\u300110,000\u6642\u9593\u4f7f\u7528\u3057\u3066\u3082\u52a3\u5316\u304c\u898b\u3089\u308c\u307e\u305b\u3093\u3002\u52a3\u5316\u304c\uff08c-1\uff09\u306e\u65b9\u5411\u306b\u9032\u3080\u306e\u304b\u3001\uff08c-2\uff09\u306e\u65b9\u5411\u306b\u9032\u3080\u306e\u304b\u306f\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002\uff08c-2\uff09\u306e\u3088\u3046\u306b\u3001\u3042\u308b\u6642\u70b9\u3092\u904e\u304e\u308b\u3068M\u5024\u306e\u52a3\u5316\u304c\u5927\u304d\u304f\u306a\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5bff\u547d\u8a66\u9a13\u4e2d\u306b\u5149\u5ea6\u306e\u4f4e\u4e0b\u304c\u898b\u3089\u308c\u306a\u3044\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u305d\u306eLED\u30e9\u30f3\u30d7\u304c\u5bff\u547d\u306e\u3069\u3053\u304b\u306e\u6642\u70b9\u3067\u52a3\u5316\u3057\u306a\u3044\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002LED\u3092\u7d44\u307f\u8fbc\u3093\u3060\u6a5f\u5668\u306e\u4f7f\u7528\u5834\u6240\u3092\u6c7a\u3081\u308b\u969b\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u52a0\u901f\u6761\u4ef6\u3067\u5bff\u547d\u8a66\u9a13\u3092\u884c\u3044\u3001\u5b9f\u969b\u306e\u4f7f\u7528\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u5bff\u547d\u7279\u6027\u3092\u4e88\u6e2c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Longevity Characteristics of LEDs As mentioned earlier, the luminous intensity of LED lamps characteristically declines slowly with use. Select LED lamps according to the level of reliability required in the equipment in which they will be used. Note the following points when requesting LED lamp reliability data from Optrans, or when using equipment to test the longevity characteristics. Temperature Conditions of LEDs It may be useful to calculate such information as the longevity characteristics (at high temperatures, normal temperatures, and low temperatures) of a discrete LEDs in an environment in which the equipment will be actually used, and to test those calculations by test operation of the equipment. Humidity Conditions [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-6999","post","type-post","status-publish","format-standard","hentry","category-application-notes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LED Lifetime &amp; Reliability: Lumen Depreciation Factors - Optrans<\/title>\n<meta name=\"description\" content=\"How temperature, humidity, and forward current drive LED luminosity decline\u2014plus temperature cycle testing and longevity simulation methods.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/optrans.com\/ja\/led\u306e\u5bff\u547d\u3068\u4fe1\u983c\u6027\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LED Lifetime &amp; Reliability: Lumen Depreciation Factors - 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