I use a 2ft 4 bulb T5 light in the top of my cab. this height is like 3 ft tall the Light Is only 3inches in height. Its awsome. Plus the reflectors in the T5 lights are german technology which is supposed to be really good. I have yet to flower a whole plant through but here is a pick of A sexing process Im trying, I hope to have decent results.

the cfl raises the temps in my Cab by only 5 to 10 degress. It works well for hot summertime.

CFL Cab Grow Log...

thats the log

kd_special