Abstract
In order to establish light emitting diode (LED) based spectrophotometric standard light source we used high-power Luxeon Star white LEDs having nominal electrical powers of 5W and 1W. Especially designed aluminum cooling block was used to protect LEDs from heating and to reduce heating effects on optical and electrical parameters. The chromaticity coordinate (CC) and correlated color temperature (CCT) properties of each LED were characterized by the measuring of spectral power distribution between 360 nm and 830 nm wavelength range. Then using spectral power distribution values and CIE color-matching functions at 2° observer, tristimulus values and CCs were calculated in both CIE-1931 and CIE-1960 spaces. CCTs then were calculated using computer interpolation method.
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