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Yeah, 48”. The Radions are 7” from water level. I guess I could always splurge and bye two more XR15s for a total of 4 and no T5s at all, but that’s last resort for me. I don’t mind DIY stuff.
I use the 4 bulb 4ft aquatic life hybrid with three xr15g5 blues mounted about 8 inches from the water on a RedSeaReefer 525. The PAR at the midway point is over 300.
The center might be a bit dim but you will have that issue with any lighting.I wish I could just add a 3rd Radion, but I have the center brace on my standard 90 gallon archaic tank.
I have 2 now. I could add 2 more, which would be the same as just using 2 XR30s. It seems like just 2 XR15s for a 48” tank won’t cut it for my SPS. Need to get ahold of a par meter.
Seems as if my options are to try and DIY some single T5s with my 2 XR15s or go with 4 total XR15s and no T5s. A hybrid fixture is too wide to fit in the canopy.

