Indoor Temperature Problem, need help!

I´ve set up a nice indoor (100 cm x 60 cm x 140 cm), with 400W lamps and three fans. Two fans on the top of the indoor, one that extracts the air and another that ventilates the air into the indoor. The third fan is at pot level.
My problem is that Once I turn on the lamp the temperature goes up 90 degrees, 30°c.

What should I do???

some options for you, from easiest and cheapest to hardest and most expensive:

move your intake fan to the bottom of the door so that the cooler air lower down enters your grow area and you aren't accidently drawing exhaust air back into the area.

use your strongest fan as the exhaust.

get bigger fans.

use an aircooled hood

use a portable airconditioner

Desertrat:
Thanks a lot for the advice, I fixed the problem. I had Mylar around the indoor and that was causing the high temperature. I also moved the intake fan to the bottom mid level.

Working like a beauty.
cheers