I've gotten really good service from the 4-light T-8 fixtures that I bought at Lowes for about $43 each. The fixtures are 8' long and the tubes are in a 2X2 configuration. I bought high quality "daylight" tubes. Going on 2 years now without a problem. I placed about 40 of these in the last Habitat store that we built in Pittboro. Same 2 year period and same good service.
Bob