As an optical designer, I often encounter problems with the calculation of photoelectric parameters in my work. The previous 100lm/W lamp is a good product, but with the development of LED , the demand is also rising. Now many engineering cases are energy-saving, and the light effect is from 120 rose to 150, or even 180lm/W, which is very headache. Let's talk about how to design a luminaire that meets the requirements of photoelectricity. The nominal value generally refers to the test data after the product is stable. You must first know the standard of the luminaire test. Most of the luminaires can be directly tested by the integrating sphere. According to the method provided by IESLM79, it is necessary to wait for the luminaire to stabilize and then test. As for some parameters, the imaginary standard products can be ignored. Figure 1. Requirements for luminaire stability in the IESLM79 Why must it be stable data? Most LED products have a decay from transient to steady state, and these attenuations are very large and cannot be ignored. By testing these attenuation sizes, you can wait for a relative thermal attenuation coefficient, see the red part. Table 2 Test parameters of 8-9W bulbs on the market Loud Trolley Speakers,Best Trolley Speaker,Portable Trolley Speaker,Best Portable Bluetooth Speaker Newmax Electronics Co.,LTD , https://www.fspeaker.com
