Assertion: lamp | /r/CapableOf | produce light
Facets:
value: over its entire lifespan.[citation
type: TEMPORAL
value: by the flow of electrical current
type: MANNER
Source sentences:
text: A lamp is a device that produces light by the flow of electrical current, and it is a general form of artificial lighting.
text: For HID lamps, there is no improvement of the lamp efficacy in using higher frequency, but for these lamps the ballast losses are lower at higher frequencies and also the light depreciation is lower, meaning the lamp produces more light over its entire lifespan.[citation needed]