Assertion: led's efficacy | /r/AtLocation | the order of 20 to 25
Facets:
Source sentences:
text: Blue LEDs have a rated internal efficacy in the order of 75 lm/W; red LEDs, approximately 155 lm/W; and amber LEDs, 500 lm/W. Taking into consideration losses due to internal re-absorption, the luminous efficacy is on the order of 20 to 25