it's a 150. I know 320 of t5 will be better than the shop lights, but I would like to have the flexibility of more wattage. I don't want to look back later and wish I got more. I can always take 1-2 bulbs out, reduce photo period, replace 1-2 bulbs with blacklight, etc. What I won't be able to do it easily add more strength if I want it later.