Most of my DE fixtures are these phantom open ones.
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I bought them for the exact reason you are considering them. I grow in rows of trays. 2 of these open fixtures per 12' of trays. Each 1k+watt fixture is lighting up 4'x6' of trays perfectly.
Cool thing about these phantom setups(the open and their enclosed) is you can seperate the ballast and run remotely. Saves height
.
I also have a few of their enclosed fixtures. I rock those where i don't need 4'x6' coverage. Usually only when i'm just covering a single tray, as their footprint is
more square.
The bulbs that come with the phantom complete setups are just as good as ushio. I had to buy 4 of my lights with seperate components, due to stores being out of the complete setups for a minute. I put ushio bulbs in those setups from the beginning and they yield the same as the agrosun bulbs that came with the complete setups.