led模块光强分布数据的解码
用LED灯具取代定向白炽灯或卤素灯,可以节约能源,延长灯寿命。安装这些灯具越来越容易,因为制造商开发和市场单位(甚至内置的驱动程序),通过连接到合适的电源工作。
为了获得最佳效果,照明设计师考虑的不仅仅是插上灯,然后打开开关。两个具有相同光度的LED光源可以产生不同的照明;一个单元可能令人满意,另一个单元的整体性能可能使它不适合于目标应用。
为了确保光源能够完成预期的工作,并且可以在不同类型之间进行定量比较,工程师可以参考详细说明其选定产品的光度特性的文件。
本文将查看这些数据,并解释如何解码规格表,以便将新光源与旧的照明技术进行详细的比较,以确保类似替换之类的计划是成功的。
Measuring luminous intensity distribution
The Illuminating Engineering Society of North America (IESNA) has developed a comprehensive test method for testing the absolute photometry (i.e., intensity and distribution of light) of solid state lighting (LEDs)。
IES LM-79-08 “IES Approved Method for the Electrical and Photometric Measurements of Solid-State Lighting Products,” provides performance data for the entire, integrated luminaire. (See the TechZoneSM article “The Latest Testing Requirements for Solid-State Lighting.”)
Besides information about the performance of the luminaire, such as luminous flux (i.e., total light output in lumens) and efficacy (lumens/Watt), the test also determines luminous intensity distribution.
This information is especially useful to the lighting designer because it provides a measure of where the luminaire directs its light output. A spotlight, for example, generates a different pattern of luminous intensity distribution compared with a down light designed for general illumination (Figure 1)。
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