Theoretical (Simulated) Spectral Power Distributions for Use in Research

This set of theoretical SPDs, intended to represent possible future color-mixed solid-state lighting systems (i.e., using no downcoverter materials), has three parts. First, a Visual Basic subroutine was used to determine a set of 100,000 SPDs. The factors were the number of primaries (three, four, five, six, or seven) and range of FWHM (2-11 nm [narrow], 20-50 nm [medium], 50-100 nm [wide], 2-100 nm [mixed]). Each combination includes 5,000 SPDs. Each primary was generated according a previously documented Gaussian distribution formula, with a random number generator used to vary the peak wavelength between 400 and 700 nm, FWHM within the specified limits, and maximum intensity. SPDs were generated from 380 to 780 nm with an increment of 1 nm. CCT is limited to the range of 2580 to 7042 K, or the extents of ANSI C78.377 nominal CCT bins for 2700 to 6500 K. <em>D</em>uv is limited to the range of 0.006 to -0.018, approximating the limits of ANSI C78.377-2017, including the extended bin range. <br> The second part includes 50,000 SPDs generated using the same algorithm. These SPDs have the same chromaticity limits, feature four primaries, and randomly-generated FWHMs between 1 and 100 nm. <br> A separate set of 15,986 SPDs from previous work comprises the third part. These SPDs are a combination of real and theoretical light sources, with spectral features as narrow as 1 nm FWHM and as wide as 100 nm.