It's not so much a matter of why not go with 1000W bulbs but why go with them when you can get away 250W. 250W bulbs are good up to about 24" deep when 400W or greater will be good for reaching depths 24" and greater. Too much light intensity on a shallow tank will bleach the corals for sure and will cost you a fortune in hydro not to mention the size of chiller you would need. It's just overkill, that's all. Why buy the 4X4 when you could ride a bike to work. Just my opinion.
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Jason
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