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I have my ballast set to 250w with a 400 w bulb because when I run ballast at 400w my temperatures are hitting 32 33 degrees Celsius which I don't want

Hi, I'm new to this and just after a bit advice my grow tent is 1.2 x 1.2 x 2m growing in soil with 16l fabric pots. I'm running my digi ballast at 250w into a 400w bulb because I can't kept temperatures down as its been 30 degree's Celsius lately outside. I'm exhausting heat into my roof too