Rather quick and painless and I am loving the results. I did 18 leds on a 4" x 30" heat sink. My tank is 36" wide, but I went with 30" because I didn't want all of that spill over. My tank has 4 fans on each side, one side blows in one side blows out. On one dimmable driver has 8 uvs, one driver has 2 cyan, 4 rb, 4 b. I went with adhesive over pads because I read the glue has better heat transfer, and honestly it was pretty easy...oh and I did the solderless kit because I was scared to solder. Piece of cake. Here is a youtube video, I wish I had a good camera like you guys to capture the true colors. The uv (violet) are awesome, it looks like a black light over my tank. MVI 0426 - YouTube my chalice flipped on the sand while I was gone for the weekend, that is why there is recession. all on with 4 t5s just uv colors uvs all on I am loving the look! Thanks rapid Now I just have to try and lower my alk (13) and mag (1650) cal is at 420. I think I am going to switch to a crappier brand and hope to get less levels. Right now I am using red sea pro.