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Spec explained
Fixture efficiency (LOR)
“Two lights with the same wattage and the same lumens... but one is dimmer? How?”
The problem
Light lost inside the fixture itself because of a poor reflector
Technical explanation
LOR is the share of light that actually makes it out of the fixture. Professional fixtures have polished aluminium reflectors that release 80%+ of the light
The result
You get the light you paid for, with no wasted energy
Related to
Guide values; the final decision rests with a qualified engineer under the applicable code.