Humidity problem fix tia

Hi all, iv got a 1.2x1.2x1.8 tent in basement, 4 pots in special mix, week 4 flower. Humidity in the basement is 85% 18c so iv had to buy a dehumidifier and attatch ducting to it and route into the tent that makes the enviroment in the tent 45-55ish humidity and about 28c because the dehumidifier also pumps out heat and its 660w, now what i thought is instead of wasting that energy using the dehumidifier is get another 600w light in there using just the passive intake vent and hopefully that will warm the air up enough to bring down the relative humidity and at lights off get a greenhouse heater to put infront of the intake flap do you think this would work? I think temps with one 600w and no dehumidifier its around 19-22c but humidity is like 75-80% i have a 6inch rvk extraction venting outside through airbrick. TIA

I think 2 600s in that area would be overkill..
Maybe if you can dim one of them you could, or raise the lights up a bit
You’d have to play around with the lights to find that sweet spot..

If you have a light on hand i say give it a shot otherwise id just keep the current setup

Your current setup while not efficient wattage wise,
Is within an optimal range of temp and humidity..

I use a 1k portable ac at times during summer..
Not efficient but its needed