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400w Radiums are 360w bulbs. You would want to get a dimmable 400w ballast and use a kill-a-watt to measure the wattage of the ballast.
IMO they look best on a 400w HQI ballast which overdrives them to around 430w. This also cuts the life of the bulb down significantly.
my tank is only 24" tall - should have stuck w/ the 250 radiums. ah, hindsight...i switched to 400w radiums on galaxy ballasts over my display in november and ended up torching almost all of my sps, even adding egg-crate and dropping the photo period to 1 hour.my tank is only 24" tall - should have stuck w/ the 250 radiums. ah, hindsight...
i think i'm switching to t5 + led.


