Is it possible for a copter to detect the heat from a 400 watt HPS bulb? Or does it only work when theres a lot more lights and heat produced? If copters can detect this heat, what can be done to insulate it better?

just depends where u have the light
and most the time 400 isnt significant enough

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The WORLD is one Big PUSSY WAITING to get FUKED

i would say always keep cool tubes on , exaust fans on intake fans on ,, it will circulate the air enough ... they had 200 + plants ,, im sure they had alot of HID's .. i know ppl who dont bother with anything less than AT LEAST 2 1000 W hps & they never sealed off windows .. mabye move ur opp to an interior room in the house ..get an air conditioner & vent all the incomming air to mix with stale hot exaust air & hot cool tube air ,,, ... ,, if not possible ,, id try to cut styrafoam to fit in the window sill , then cut out cardboard to fit snug in there & layer that cardboard about 5 or 6 pieces .. then on the very inside put a piece of plexi glass cut to fit percisely.. can never bee too safe

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everything i type on here is all BS , all pics are copy & pasted from an official weedsite, i do not condone the use of any illegal narcotics