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Do you need both MH and HPS? If the answer is yes, you should consider a switchable ballast. I've never used the digital kind but would probably buy one if i were currently in the market.
They also sell a dual-spectrum ballast/reflector (which is what I use) but is kind of pricey. If you are interested, let me know and i'll explain it better (or check out my GJ for pics).
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