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 ...
Online Language Learning Tool SkELL allows users to search for phrases in sentences, collocates and similar words. These examples have been automatically selected and may contain errors.
