Impact of spectral features of common LED lighting systems on TM-30 color indices.

We examine the difference between the newly developed IES TM-30 color indices and some of the most common previously established color indices for LED systems which are used for lighting purposes, focusing on the influence of realistic spectral variations among different system designs and manufacturing runs. We find a significantly stronger influence of the employed blue InGaN wavelength on TM-30 R and R than on CRI R and FCI. In addition, for the established combination of green converted InGaN chips with red InGaAlP chips, we observe large differences in the effect of the wavelength of the red emission of InGaAlP chips on R and R.

Color uniformity in spotlights optimized with reflectors and TIR lenses.

We analyze the color uniformity in the far field of spotlight systems to estimate visual perception with a merit function derived from human factor experiments. A multi-colored light-emitting diode (LED) light engine with different light mixing levels is combined with several reflectors and total internal reflection (TIR) lenses. The optimized systems are analyzed at several color uniformity levels with regard to the efficiency, peak luminous intensity and dimensions.