Assertion: lamp's efficacy | /r/HasProperty | lumens per watt
Facets:
Source sentences:
text: Also, they have higher efficacies (lumens per watt) and better lives than non-halogen types.
text: The Illuminating Engineering Society of North America (IESNA) in 2008 published a documentary standard LM-79, which describes the methods for testing solid-state lighting products for their light output (lumens), efficacy (lumens per watt) and chromaticity.
text: The efficacy (lumens per watt) is about half that of