My two cents: Light fixtures are expensive. What you've got is great. Use the extra $$ for the vortexes instead.
I spent the money on a whole house A/C and kept the WHOLE family comfortable and heat in the tank down. All I have is a small fan set along with my MH timer to keep my temp down to around 79F.
But prior to installing the A/C, the temps did got up to around 80 to 82, just like yours. Ran like that for years, and no problems as far as I could tell.
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