Comment on “Optimization of a spectrally tunable LED daylight simulator”

Abstract

AbstractThis is a comment on “Optimization of a spectrally tunable LED daylight simulator” (Color Res Appl. 2017;42:419‐423). We found that full widths at half maximums (FWHMs) of light‐emitting diodes (LEDs) used in the six channels for daylight simulators given by Wei were 50 nm, not 30 nm. Therefore, it is impossible to implement AA‐grade daylight simulators with six LED channels. By our simulation, it was found that at least seven LEDs channels with FWHMs of 30 nm are required to produce a spectrally tunable daylight simulator with AA‐grade by appropriate intensity combinations. Furthermore, the spectrally tunable AA‐grade daylight simulators using six, five, and four channels were simulated. We have first reported that the scheme for the spectrally tunable daylight simulator with AA‐grade using three, four, and five types of phosphors or quantum dots excited by an ultraviolet LED.