How soon do LED Replacement tubes produce an ROI?
Compared to traditional indoor, general lighting sources, how quick does an LED replacement tube produce an ROI? I say "never, ever, period." Most of these tubes are $50+. Compared to a well designed T8 system, LED tubes just don't deliver any financial advantage. Even if I use .15 cents per KWH and 12 hour days, I just can't make the math work. Here's my math, my notation is bad in some places since I've used this form for other projects: https://docs.google.com/file/d/0B7ICePOWxbT6R0wyREtURVpJdkk/edit
I get a lot of customers asking about this product and even more vendors trying to sell it to me. If I'm off somewhere with this math, let me know.