You can't have too much light for SPS; at least not in the budget of a average teenager. 250 is fine for everyone including mushrooms. Light is just one thing to worry about, water quality and flow along with food is also just as important. You will also need a fan + heater to keep the temp in range, put it on the sump and the heater works when you forget to turn off ur fan on a cool day. Good luck, and welcome to the SPS cool kids metal halide 250watt+ per cubic meter league.