I'm replacing 2x4 troffers (lay ins), each housing 4 x 40watt cool white T12s. So doing the basic math, these traditional T12s produce ~2600 lumens x 4 = 10,400 lumens. BUT most of what I see out there for 2x4 LED troffers is between 4,000 and 7,560 lumens. I know the T12s will lose some lumens over life, but I know I'm missing some other basic fact, when comparing (replacing) fluorescent lumens to LED lumens.
I want customer to be happy with light output and want to but the right replacement the first time.
Appreciate guidance here. thanks, Dino