Assertion: lamp's light | /r/CreatedBy | the mercury arc
Facets:
value: to pass
type: PURPOSE
Source sentences:
text: These two changes combine to allow the 253.7 nm ultraviolet light produced by the mercury arc to pass out of the lamp unmodified (whereas, in common fluorescent lamps, it causes the phosphor to fluoresce, producing visible light).
text: The coating must be thick enough to capture all the ultraviolet light produced by the mercury arc, but not so thick that the phosphor coating absorbs too much visible light.