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what i was getting at really is that in my experience with the t-12 lights at least, is that if you fire a VHO bulb at a lower wattage it will last longer than it's lower wattage counterpart. I have not tried or looked into under driving the t-5 VHO's though.

i sold aquarium lights for a long time, and i had a customer who was big into freshwater plants that swore by using the t-12 VHO's in the reg t-12 fixtures because they would hold spectrum longer.

it's refreshing to find some people that see the science smacking them in the face too. I spent ten years selling the aquarium lightings and have been wondering why no one is talking about using these bulbs. most people tell me i'm crazy and aquarium bulbs won't work because I'm asking them...