How is 2x400 less power than 3x250?
The 400s are going to burn 800 watts and the 250s 750 watts?
I'd stick with 250s myself. I know it's a dying breed but I've finally tracked down another hqi ballast for my tank. I can run my radiums as they were intended and down the road I can run a lower kelvin bulb and get super sweet par numbers.
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