Alot of us run t-5 lighting and have done extensive research on different combos. Choice comes down to what you prefer to look at. Alton's combo looks and sounds good. I currently run a 4 bulb combo of Ati Blue+, Uvl Aquasun, and Uvl Actinic White, and an another Blue+. Grim has alot of corporate backing and time to play with lights - something most MAAST folks don't have. I did the reading he produced, talked to a bunch of others running t-5, researched the web, and bought several lights to find combos I liked for my 30g and old 90G.