Standard white light source
The NL-500C is a standard natural light for a visual assessment of a fading color after performing weathering test. Spectral distribution curve of the xenon lamp is the most similar to energy of sun light which contains visible and UV light region. The maximum intensity of illumination is 5,000Lx, which allows to compare lower brightness color or similar color. The natural light box is necessary to evaluate fluorescent color and metamerism.