ES-LM79和LM80之间有什么区别?主要有哪些测试项目?要多久完成? LM79和LM80 测试对象都不一样,仪器设备也不一样。 IES LM79 IES LM79是IESNA(北美照明工程学会)批准的灯具能效标准,主要测试为光电性能测试,由于某些测试项目需要借助分布式光度计才能完成,所以一般的厂家没有能力做一份完整的报告,这个测试一般针对的是整灯的厂家。 主要的测试项目如下: 总光通量; 发光效率; 光强分布; 相关色温(CCT); 显色指数(CRI); 色品坐标(或称色度坐标); 输入交流(或直流)电压; 输入交流(或直流)电流; 输入功率(DC或AC); 输入电压频率; 功率因子; LM79 测试一般1个星期内可以完成;提供2个样品,费用相对比较便宜。 IES LM80 IES LM80是光通维持率(LED寿命)标准,主要测试的是光通量输出的维持率,也就是LED光源的的寿命测试。 测试对象: LED 芯片,目前市面上LED芯片尺寸比较多的是2835,3014,5050,5730,3030,仿流明,大功率集成COB等。 测试设备: 注:光通量是指光源表面辐射出能被人眼视觉感知的光能量。其计算单位是流明(lm)。 LM-80 的测试项目:1、光输出。 2色坐标,有3个温度点要测,55度,85度,客户还要指定一个温度点。各20个共要60个样品; LM80 测试需要6000小时,约9个月时间,费用较贵; 如果LED灯要申请能源之星,需要提供光源的LM80报告,但并非有了LM-80数据就不需做光通维持率,同样需要测试验证。 Link: LM79和LM80是什么? http://www.cnledw.com/inter/show-15-76868.htm Understanding LM-80 to evaluate LEDs http://www.eetimes.com/document.asp?doc_id=1280235 http://www.lightlaboratory.com/pdf/lm79_80understanding.pdf http://www.360doc.com/content/11/1011/13/5031123_155159568.shtml http://blog.renren.com/share/227513694/4291815770
Integrating sphere
An integrating sphere (also known as an Ulbricht sphere) is an optical component consisting of a hollow spherical cavity with its interior covered with a diffuse white reflective coating, with small holes for entrance and exit ports. Its relevant property is a uniform scattering or diffusing effect. Light rays incident on any point on the […]
The Sad Surreal Aftermath Mother Temper Tantrums
We all know how destructive Mother Nature can be. But sometimes the destruction and mayhem that result from her temper tantrums can not only be terrifying, but also really bizarre. So, here’s your reminder that Mother Nature can be absolutely ruthless and you should never, ever leave the house. #23 #22 #21 #20 #19 #18 […]