This is a 125 fowlr tank. I replaced the 54w t5 bulbs with a rapidled.com retrofit kit. I used aluminum c-channel from lowes as a heat sink. I have two strips about 6' each. One has 12 cool white xp-g r5 leds with 80 degree lenses. The other has 12 royal blue xp-e leds with 80 degree lenses. The lights are about 8 inches from the glass lids. The glass covers the entire tank in order to keep the eels inside. There is a 1 inch gap between the glass and the top of the water. The par readings are not that great but considering how high the lights are, the wide lenses, and a dirty glass cover I think they are reasonable. I have some gsp on top of one rock and on the sand bed. Both seem to be doing fine. I think if I switched to 60 degree lenses and dropped the lights down 5 inches I would get double the par.



These reading are from a rapidled.com par38 bulb. The bulb is 17w with 7 leds and 80 degree lenses. They are 3 Royal blue, 1 blue, 2 cool white, and 1 warm white. I wanted to compare this bulb to my evil's par38 with has 3 royal blue and 2 cool white. I only saw a slight difference in the colors. I used an orange ricordea for comparision. The big difference was in the par. Because the evil par38 has more watts and 60 degree lenses it had higher readings in my other post. I prefer the par and the colors from my 5 led bulb. I think the rapidled bulb would be better for a smaller nano tank. The picture shows all the bulbs on, but I tested the bulb with the other two off.