Abstract
The spectral optimization of phosphor-coated white LED (pc-WLED) with green and orange phosphors excited by blue chip for road lighting was investigated based on the mesopic limited luminous efficacy () and IES (the Illuminating Engineering Society of North America) color fidelity index (). The average of four road lighting standards of the USA and the UK decreases as increases, but the optimal scotopic/photopic ratio increases slightly with increases for a given correlated color temperature (CCT). The average could reach the highest of for , for , and for at . Six real pc-WLEDs with different at and with at different CCT were demonstrated. Compared with current pc-WLEDs with yttrium aluminum garnet doped with () phosphors, the average of six demonstrated pc-WLEDs will be over 5.0% and above. So, it is suggested that the road lighting should choose pc-WLEDs with high efficiency green phosphors (520–530 nm) instead of phosphors.
© 2018 Optical Society of America
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