If I understand correctly, and youre venting your hot air from the lights right back into your flower room, it should actually save you some electrical usage as you're already basically cooling the unvented lights due to not exhausting the hot air coming off them outside the grow area. Also you won't need to run the exhaust fans and can unplug the fan/fans pulling air through the lights, one less thing plugged in suckin juice = that much less electrical usage.
I can say that my regular flower room has air cooled hoods in a completely sealed room with CO2 and my "finishing room" (no co2) I'm running lights w/o the hoods and can see a noticeable difference in resin production with the glass out. Actually has me re-thinking my decision to run air-cooled in the main flower room. Easy enough to change though. Hope this helps. MGG