Passive Intake or Less Exhaust?

Here's my question.

I have 1 x 8mm fan intake, and 1x 120mm fan exhaust. My temps are too high (only a 40 cubic foot growspace) for my 1 plant (lots of CFLs).

I bought another 120 mm fan.

Should I:

a) Install it as another exhaust, and then cut a hole in the bottom for a passive intake.

b) install it as an intake, and force more air into the box, and the exhaust fan will obviously be able to vent a little better because of the new pressure...


What do you guys think? Any advice is appreciated.

I needed to do something today, so I just installed another intake. I've got a fan within the box that blows upward, so hopefully it works out

I think the hot air generated by your lights will be stronger than the extra cold air intake that you add. You said your temperature is too high, so I assume your ventillation is fine, so I would add the extra fan to the exhaust. If you do add the extra fan to the exhaust just pay attention to your humidity.

What bulb are you using? 400 HPS/MH?

no put it as an exhaust fan. it will be more effective. trust me on this.