Would this work if I build a polycarbon box seal itUp wil any moisture get inside D box if it's cold outside with a4ft LED no heat fixture?

ok so i am thinking if i put a LED 4 feet fixture light in side a polycarbon box and seal it up and a strong brass cable seal the part where the plug come out of the box also the cable holes also would the box keep the light from getting any moisture to the light
Update: getting any moisture to the light fixture i mean to try to keep the light fixture dry
Update 2: i mean try to keep the light from getting any moisture trying to keep it dry
Update 3: i mean try to keep the light fixture from getting any moisture trying to keep it dry some how
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