I bought 10 of the 8' long, four bulb T8 fixtures made by Cooper/Metalux. I bought them at Lowe's for around 40 bucks each. I have installed 9 of them so far in my 28'x32' garage with 12.5' ceiling height. I used the 4100k bulbs. Six of them are on one swith and four on another switch.
The...