Grow tent guidance

Ok all, got a 2 x 4 grow tent. Doing a test with ut. With the lights on in the day, the tent stays warm enough with the light. At night the tent isn't staying warm enough. I need ideas of what to use. I'm super paranoid about fire risks, so I really need some help here.
 
I use small electric heaters rated at 350 watts inside my tents when it is cold. They are about the size of a one liter bottle. Add an inkbird or other temperature controller and you are good.
 
Ok all, got a 2 x 4 grow tent. Doing a test with ut. With the lights on in the day, the tent stays warm enough with the light. At night the tent isn't staying warm enough. I need ideas of what to use. I'm super paranoid about fire risks, so I really need some help here.
Light cycle at night? (I got my garage tent like this and it's at 83 while mid 40's outside, warms up the entire garage).
 
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