I am using a 6 bulb t5 now to veg. The power is great. 30k lumens over 4 plants to veg and sometimes I lower it 2 20k for power consumption. I paid about 170 for it new at a hydro store with 6500 k bulbs.
It has no heat! I mean none. I am so happy. There was all kinds of thot that their was heat on the threads. I bought it and I got none.
Plants love it.