Hello mate. My last grow I used a 75 x 75 x 200cm tent with the 250w. I had issues with temperature and humidity so I have gone bigger to a 100 x 100 x 200cm tent. (My lamp has also gone bigger, but I'd recommend this size tent)
My hood/reflector is an Adjust-a-Wing Avenger with the Super Heat Spreader thingymabob.
I use 6inch passive intake bringing air in from around the window area, with the window open slightly, depending what its like outside.
Carbon Filter with 4 inch exhaust fan and 4 inch ducting venting into the same room as the tent.
Not sure what the best temperature is to be bringing into the tent, get your self a good digital thermometer and just keep an eye on the high and low temperatures.
Hope this helps!