A cheap fix would be to exchange the tek reflector with the ATI sunpowers.Reef Geek had them on clearance for $10 each. I replaced mine with the ATI Sunpowers and they are a perfect fit. Also, for more par would be to add a fan in the fixture.I also have done this and is an easy mod todo. It also keeps the ballast from getting to hot which adds life to it. I have had this tek for 3 years without any problems so far.
I don't think adding an ATI ballast to a tek is a good idea if the fixture does not have proper cooling.
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