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Re: T8 efficiency vs. temperature

> One other question.  The double fixture has an inside
> covering of mylar and sits directly on the glass.
> Will the bulbs run cool enough to be the most
> effective they can be?

Ivo Busko wrote:

According to a data sheet from Sylvania, a T8 bulb operates at 100%
efficiency between 22 and 27 C. At 30 C, efficiency drops to 97%,  at
35 C to 91 %, and at 40 C to 85%. That's a lot. I'm thinking of using
a Radio Shack probe thermometer to check the air temp within the light

I reply:

That is one of the reasons that T5s are better for aquariums. They are
optimised to run at 35 C.