Suck through tube?

Hi all, I have a small attic cab for flowering thats about 4'x4'x4'. Heat has been a problem. I ended up using two large turbine fans (about 420cf each) as well as several circulation and duct fans. one to exhaust and the other for the DIY cooltube exhaust. Temps still peak at about 91f and it's not even summer yet. I am thinking about changing it to suck everything via the cooltube. I am wondering if this would have any adverse effect on the lamp. The reason I'm thinking about doing this is because right now I am using way too much ducting to vent, and it has slowed the air flow altogether. Any thoughts appreciated.

One thing to watch out for is the airflow temperature of the air flowing through your space. If you over power the space blowing air all over the place the heat will simply be bounced around and not allowed to evacuate the area. I have been fine tuning my setup and I noticed today that if I add to much intake air it stirs up the air in the room causing the temp to be warmer than if I didn't have it at all. So if you have some way of getting cool air into the area when you point the fan(s) think about the air as having differently temp levels. Its better to point the fan vertically as to not blow the hot air from the ceiling down and vice verse. My two cents at least.

I have noticed that in a small space cold water has a noticeable difference especially with high air flow. I have a two gallon bucket there with 6 ice gel packs. They take 3x longer than ice to melt. I used to throw them in the reservoir but I'm too paranoid that one will leak. The fans carry the cool air into the intake area and I watch the temp drop by 2 or 3 degrees. It only last for a few hours but it helps when the temps start to get into the upper 80s lower 90s.

Yeah, I was having a problem in the veg cab with temps and humidity, so I got a "reli-on" humidifier at walmart. It lowered humidity and, it lowered temps by almost 8 degrees! If you get one be sure it's the "utrasonic" model so that the mist is cool (like a fog). Also get one with an auto-shutoff feature (mine doesen't).