I'm currently planning out a 180 and RapidLED recomends between 100 and 125 3W CREE's for keeping SPS
corals. At roughly $4-6.00 per LED
we're looking at around $4-600.00 just for the LED
's. The drivers cost around 20-30 each, and can handle 12 LED
's each. Or you could get a larger driver and run multiple strings in parallel. You would of course want to use inline fuses so you don't blow your LED
's. After looking at as many scenerio's as I can think of, I can't get the cost of DIY below $800.00. Remember not all LED
's perform the same... If you go cheap, your probably going to regret it. IMO
there are some nice fixtures out there that are much more affordable.