there are 3 - 250 watt w/ 20000k bulbs and there are 2- 72 inch Vho's one is actenic one white may change it though.Ballast are ARO and bulbs are XM. All I need to do now is make the doors this weekend. OH yea there are fans one in and one out I also got a 12 inch fan which I will hook up inside for the fan going out cant seem to keep up. But temp is remaining the same which I was glad.Just keeping good eye on the corals to see there adjustment for the Leathers are the only ones so far that seem to be doing harder on teh adjustment they have yet to open up hope they will make it through.