150 watt metal halide, but most lps prefer low light, PCs would work fine for torches. My brain doesnt open all the way as possible since it gets quite a lot of light and flow.... I got a medium-high flow and medium-high light, i feel with the right positioning i can get anything in this tank, thats why i like MH lights. My sps are directly under it with slightly direct mj600 flow, my leather is about the same as well. zoas/shrooms are wherever i can get them, lps are far away from light, and xenia are in the far corners with the lowest flow and light.