That is a very attractive price on that product. The digital ballasts do tend to eat bulbs fairly quickly, especially the cheaper brands. Maybe it would be ok. You wouldn't know until you tried it, and I'm guessing the people on Amazon leaving positive reviews have not used the ballast long enough to see how long their bulbs last. Their bulbs are labelled "Hortilife," which is obviously a cheap ripoff of Hortilux, which has the best reputation as a brand.
I would probably buy it because it is so cheap, but just not expect it to last long, especially the bulbs. And by the way, this doesn't happen with the HPS bulbs, but with the Halide bulbs you really need to make sure they don't get too hot; put a fan or cooling system on it. It's about 1800 degrees inside the MH bulb normally and 90 psi. Get it too hot, and they can explode and send 2,000+ degree pieces of glass everywhere. Most building products ignite easily at that temperature.
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