When you're using 400W halides you're sucking up a lot of power and even the best halide equipment is still very inefficient. For this reason you're better off investing in better reflectors that mount the bulb in the most efficient way for tank lighting. Of course this cheap alternative will work but you'll loose efficiency and it'll cost you more in the long run. It's also nice to have remote ballasts to keep them away from moisture.
So yes they work but IMO not worth the savings, the reflectors are useless so the ballast is the only really useful part. However paying $60 for a used industrial ballast makes little sense to me when you can get a new vertex for less than $150.
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