Well, it's clearly designed for industrial lighting, not horticulture use, and that large spike in the middle of the green spectrum will probably be wasted. It looks like a HPS/MH combo light, which could be great for vegging. The life is only 20,000 hours which is similar to typical MH bulb life. When it says the lumen maintenance is 85%, that probably means you'll get 85% of your initial lumens at half the bulb's rated life. I've seen other representations of lumen maintenance, but the % of initial lumens at 50% life is the most common. Also, lumens are about the same as a typical MH non-conversion bulb, so that's pretty good.

If you're familiar with regular MH bulbs, this looks like it'd work a lot like they do, but with a broader spectrum and in a HPS ballast. And because it's designed for industrial use, the low price probably has more to do with economy of scale than quality. Go for it!