Assertion: led's efficacy | /r/HasProperty | achieved in february
Facets:
value: by using nanocrystals
type: MANNER
Source sentences:
text: In February 2008, a luminous efficacy of 300 lumens of visible light per watt of radiation (not per electrical watt) and warm-light emission was achieved by using nanocrystals.
text: In February 2008, a luminous efficacy of 300 lumens of visible light per watt of radiation (not per electrical watt) and warm-light emission was achieved by using nanocrystals.