Make sure they have waterproof endcaps and individual reflectors. Do you have a canopy?? You could do a DIY T5 (very simple--ballast, bulbs, endcaps, reflectors). I just finished mine and it works great.
Never heard of any issues. However, when you buy them off Ebay, make sure they come with reef rated bulbs (10K, 14K, 20K). Sometimes, you'll see TEK lights sold for cheap on Ebay because they come with the cheaper horicultural rated bulbs (3K,5K,8K). These bulbs will be too yellow/white and will grow more algea than coral.
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