So I started with 2 aluminum heat sinks and 2 non dimable Meanwell Ballast. I purchased 2 fans and 15, 3 watt luxeon cool white LEDs from rapidLED. It was growing chaeto but a lot of whitening on the surface. Probably too intense. I researched the lights used for refugiums and found that more red and blue spectrum was used. So I spent about $80 more and bought 8 photo red cree LEDs, 4 royal blue, the dimmable ballast pictured and a dial dimmer. I disassembled the housings that I also made out of plexiglas and welded in the new LEDs. I did one light first and after seeing the much improved growth of chaeto. I did the same work to the other one. Amazing and something to feel proud of!