You'll see a big drop, I'm running 1500 watts of LED in my tent and at night it stays stable at 28.c, I also pull in air with two AC Inifinity 351 CFM fans, one for extraction the heat out through a filter the other directly from the window. My air exchange is constant and pretty fast, coupled with a mist maker running during the light on period to compensate for the loss of humidity the mist cools the room even more and maintains my humidity at around 50% (yes i know 60% is ideal for veg, but my plants dont seem to mind this).