I have recently set up a 120gal tank and have 2 of the 4-65watt pc for my lighting. The tank looks aswome. They are the 48" coralife lights. My tank is 60" long so my lights cover about 100gals, its about 5.2 watts per gallon. The total of 520watts per 100gal. Don't have any coral's yet, still letting it get established. I'm interested in seeing what i can do with my lighting. Have about 120lbs of lr, working on my clean up crew at this time, or should i say waiting for saltwaterfish.com to get moved in there new building.