I picked up the led strip from ebay,for specs and cost I will post the page shortly. It is 120mm or 48inches exact . with two strips on the aluminum it has a slight sag with only one it does not sag. two strips, one on one side the other a few inches away provides enough light for my entire tank. my tank measures 48 x 24 , so the strip goes from end to end and both strips are on one power source. the power adapter can run three strips. I did this after seeing another MR reefers tank with the same amount of strips (2) on his tank, he stated that he had them on for a while and had gotten good results. I then bought some for myself.