I'm thinking about putting 4 15watt bulbs on my 10 gallon tank since it would be amost to be what is considered "medium lighting" Would 4 Chroma 50's be good or would it be to blinding since they are 5000k spectrum? If not, what color spectrum could I mix my 2 existing chroma 50 bulbs with to reach 6 watts to the gallon and not blinding :) - Matt