I have had a 70w 10K HQI + 1X28w PC actinic on my 10 for a year now. It's OK but there are few choices of bulbs with a 70. I am building a 150w HQI for it that will have a 14K bulb & I'm thinking I'm going to like it better. There will be 3 fans in the hood and the tank has an auto top off system. Evaporation is significant.