For $400, you'd have to go the super budget route. Honestly, I can't think of any LED grow lights with a flowering coverage area of 4x4 for that low of a price. For $450 you can get the TS3000 by Mars Hydro - that will cover a 4x4. Also, discount code MRGROWIT will give you a small percentage off
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I use the bloom plus bp3000 from Amazon it works well for my 4×4 and is less than 400
Sometimes Amazon has the spiderfarmer sf4000 for $450, right now it is about $500.
For $400, you'd have to go the super budget route. Honestly, I can't think of any LED grow lights with a flowering coverage area of 4x4 for that low of a price. For $450 you can get the TS3000 by Mars Hydro - that will cover a 4x4. Also, discount code MRGROWIT will give you a small percentage off
http://bitly.com/2RovEIn
But yeah that's a tough one. I'd love to hear if anyone else has suggestions.
My list of the best LED grow lights for a 4x4 flowering coverage area: https://www.mrgrowit.com/post/best-led-grow-lights-2020-4x4-coverage-area