What Temp Is Best?

my room is 6'x9'x8'
i have 8 plants in a aeroponic/hydroponic sys.
i am having trouble keeping my temp below 77 F
should the temp be lower or is that a fine temp for young plants in veg
 
Air temps on the grow deck, under the lights. The ambient temp out in the room is lower. My room temp is 69 right now. In the closet under the lights it is 80 - perfect.
 
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