So far--
Radion xr30wPRO--$899X4=$3600. 12" wide, so wouldn't cover whole 72" tank unless higher above water and spread them out a lot, which MAY be just fine, but I'm not sure. Total of 175wX4=700watts. Very controllable.
Maxspect razor r420r @160watts. 27", so X2=60" of 72" tank covered, with less control. X3=90", overhanging tank and wasting light. So X2@$500=$1000.
Maxspect Mazarra MZP01 complete system with 4 modules @ 60watts each=240 watts and $2100. Prolly need two sets, so 480 watts and $4200. Very controllable, and easy to adjust modules with the hood system that comes with it. Not sure if I'd suspend or use hood system. May even need 3 sets, so that's 720watts and $6300. More bulbs spread out with variable lenses seems like the lights should blend better than on the Radions. Can't afford 3 sets though, so that would put me at 480 watts for the tank. Not sure how many watts/gal are recommended for LED's. I'm used to halides and t5's.






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