As for "what colour white"...ADR 78/00 covers that one...
3. TECHNICAL REQUIREMENTS
3.9. Colour
3.9.1. The colour of the light emitted shall be white or yellow, as prescribed on the relevant data sheet.
3.9.2. In case of white light, the calorimetric characteristics, expressed in CIE chromaticity coordinates, shall lie within the limits given on the relevant data sheet which are to be within the area formed by the following limits:
Towards blue...............................x > 0.310
Towards yellow............................x < 0.500
Towards green.............................y < 0.150 + 0.640x
Towards green.............................y < 0.440
Towards purple............................y > 0.050 + 0.750x
Towards red.................................y > 0.382
3.9.4. The colour shall be measured according to the conditions specified in annex 4, paragraph 10.
This basically means the bulb colour should be 4100 K, with a tolerance of between 3500 K and 5000 K.
Bookmarks