Six VHO bulbs from Ultraviolet Resources, Inc. (URI)  Current configuration:
Two IceCap 660 VHO ballasts are being used.  These ballasts are very efficient and can be used with just about any combination of flourescent bulbs.
Equipment
One 72" SuperActinic One 72" Actinic White
Two 48" AquaSun       Two 72" AquaSun
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