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Sciencing Daily
Just from my tank- when the halides go off I'm looking at the 3 39w ATI Blue+s and one 39w Fiji and it looks dark. Granted my eyes are used to the intensity of the 4 T5s plus the 2 halides I still think that 6 bulbs for SPS would be a minimum and if I could I would run eight. To be clear all
eight would be on for just a portion of the photoperiod just like my halides only run for 6 hrs.
I think that it is a little over kill. They can take it and probably grow really well, but I run a 4 bulb t5 over my tank and get very good growth and really nice color from all my sps. Some of the aro's are near the bottom and show no problems with the light. They can take a lot more, but they don't necessarily need a lot more.