in 2020) was the first company to breach 300 lm/W efficacy barrier, according to company’s official press release (2014). White light LEDs have a maximum theoretical efficacy around ~ 350 lm/W, which means that we are not there yet, but we are getting really close! Cree (who sold its LED business to SMART Global Holdings, Inc.
Visible Light Spectrum Colors Wavelengths Why? Because our eyes are not that sensitive to other colors, particularly to the extreme blue ( 700 nm) ends of the scale, and we are completely blind to ultra-violet and infra-red (IR) spectrum and beyond. Why 555 nanometers you may ask? Because, standardized V(λ) curve that describes average human eye sensitivity to visible light peaks exactly at that number! We have to thank our surroundings in nature for that, obviously! In another words, an ideal LED light source would emit “pure green” and convert 100% of consumed electrical energy into light, achieving above maximum theoretical efficiency limit.īut, what about other colors? What about red, blue, yellow, orange and white? Well, whenever we shift, spread or stretch spectrum of emitted light to include other colors in the output, we reduce maximum theoretical efficiency. Maximum theoretical efficiency of ideal light source is equal to 683 lm/W at 555 nm monochromatic green color wavelength. Luminous efficacy of the visible light spectrum radiation (LER) is expressed in Lumens per Watt (lm/W) unit. SMD LED CHIPS Ideal Light Source: 100% Efficacy
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