I started with CFLs, then went on to 2x 90w UFOs 'blurples.....yuck ..then went 400w CMH, 'which was so great '...then a 600w HPS Son T...great results !!!.....and now I run Cobs .....infact i swear by them.....
The 600HPS did have huge dense results...but my last grow which ran just shy of...