Quote from Marine Depot
Usage Guidelines - One Radion fixture is comparable to one 250w metal halide
- Generally, one Radion fixture should be used per 40 gallons (150L) of water volume.
- Approximate surface coverage is 24x24 inches (60x60cm).
Does this refer to water volume in the tank only and if talking about just tank size, for a 90 gallon should I go for three? Really like what I see and seriously considering switching over from MH to LED now.