Proof Light - Frequency (Mhz): 50 Hertz (Hz)

For textiles, a "Proof Light" typically refers to a color matching cabinet or light box used to assess and prove the color accuracy of textiles under various controlled lighting conditions. The key specification is the inclusion of multiple standard light sources to detect metamerismwhere two colors appear identical under one light but different under another.
The following specifications are based on textile industry standards like ISO and ASTM.
General specifications
Specification Details
ConstructionA lightproof wooden or steel cabinet with a neutral grey interior finish to prevent color distortion from ambient light.
Light sourcesTypically includes between four and seven standard light sources that can be switched on independently. Common sources are: D65, TL84, CWF, and UV-A.
Viewing angleA standard viewing angle of 45 degrees is required for proper visual assessment.
Viewing areaDesigned to provide a wide, evenly illuminated area for comparing samples, with typical dimensions around 675 x 455 x 400 mm.
Control panelA centralized control panel allows for easy selection of the desired light source.
TimerAn hour meter, often imported from Germany, tracks the cumulative usage time of each lamp. Lamps should be replaced after about 2,000 hours of use to maintain spectral accuracy.
ComplianceBuilt to meet international standards such as ISO 3664, BS 950, ASTM D 1729, and DIN 6173.