Figure 5 | Light: Science & Applications

Figure 5

From: Advantages of white LED lamps and new detector technology in photometry

Figure 5

The spectra of (a) 26 warm white LED lamps and “Illuminant” LW (red line with markers) and (b) nine cool white LED lamps and “Illuminant” LC (blue line with markers) normalized to the blue peak. The correlated color temperatures were between 2611 K and 3332 K for the warm white LED lamps, and between 4178 K and 8334 K for the cold white LED lamps. The peaks of the blue LEDs span wavelength ranges of approximately 30 nm and 22 nm for the warm white and the cold white LED lamps, respectively. Due to the variation in the wavelengths of the blue LEDs, the blue peaks of the averaged spectra were below unity. For the figures, the spectra of “Illuminants” LW and LC are again normalized to the blue peaks, which raises the phosphorus parts of the spectra above the original average.

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