thermostat controlled ventilation and 600w HID without air-cooled hood/cooltube

so i found this fan

do you think it´s overkill in 4x4 tent? i am about to use it in spain where the climate is warm. my main goal is to have good enough ventilation to use 600w hid with no air cooled hood to get max out of my light.
one of the biggest concerns of mine is when the lights go out and temperature drops is this kind of fan just going to turn off and start when lights go on again or just adjust the speed of the fan.
how big impact it would be for the plants if the fan turns off for the most of the "night"?
i am going to use large carbon filter designed to 1000m3.
i am going to use 4x 5 gallon dwc so it would be nice to maintain stable temperature in the tent at alltimes to prevent water temperature going up.
all help and advice is welcome.

(sorry for m shitty english :D)
 
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