i purchased 2 V2 photon Reeef Breeder LED's for my tank. They are maybe 44" long by 9" wide so on Sean's reccomendation I bought 2. Once you figure out the remote controll light programming they are really easy to use. Going from Halides to LED's for the first time the thing I noticed the most was reduced heat,noise ( no fan), the 6 different colored lights, and how much you can manipulate the colors. I only have them running at about 50% of capacity as I don't want to bleach the corals. I will take it up slowly. Too early to tell by coral growth, but they all seem to grow pretty well under the LED's. It's also worthy to mention i will save over $200 a year on new bulbs. Which would pay for both fixtures in about 5 years. I really hope they grow as well as Halides.