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I'm in the process of transitioning corals from a MH tank to one with a 6 bulb Sunlight Supply TEK fixture.
I have giesman bulbs on the TEK and it is very much visibly brighter than my 250 watt MH + antics.
I'm pretty satisfied with them. The main selling point for me was that the TEK light is pretty much silent, while my MH has a fan that sounds like a jet aircraft hovering above my house.
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