Udulaternate värvus peab rahuldama järgmisi nõudeid:
- värvi puhtustegur ei tohi olla väiksem kui 0,82;
- piirväärtus valge poole y >= -x + 0,966. (On lubatud ka piirväärtused y >= -x+0,940 ja y = 0,440.)
The filament lamp glass envelopes shall be colourless or of selective-yellow colour. In the latter case, the dominant wave-length of the light emitted shall be between 575 and 585 nm (nanometres); the purity factor shall be between 0 790 and 0 798, and the transmission factor shall be not less than 0 778 ...
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