I have the Tek 4x24W and I love it. It may not be fan-cooled but with a minimum level of DIY skills, you can cool the fixture down by a whole lot. Just point a fan at it. Putting an acrylic shield only heats it the bulbs and decreases the life. The New Wave unit is not intended for aquariums from what I read. If you are looking for a fan-cooled unit with a good price/performance ratio, think about the Current Sundial unit. The default bulbs are average but the fixture comes with individual reflectors.
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