Assertion: lamp's bulb | /r/HasAspect | efficiency
Facets:
value: in the range
type: OTHER
value: typically
type: DEGREE
Source sentences:
text: About 24% of the energy used by metal-halide lamps produces light (an efficacy of 65–115 lm/W), making them substantially more efficient than incandescent bulbs, which typically have efficiencies in the range 2–4%.