U can DIY the MHs.
For a 150W MH 10k, it won't cost u more than $250 if you DIY.
If you going to buy 4 10000k pl, it will cost you say $180?
IMHO, it will be better as you won't hv 2 upgrade liao...
Furthermore the single bulb can last 4 2 years and u only change one....
U hv 2 change the 4 pl say in 1.5 years time???
IMHO.... Just do yr maths.... Tat if u can take care of e heat issue.
Happy New Year to all!!!!!