HUMIDITY PROBLEM - HELP NEEDED (please)

I have a problem with my humidity! i have 2 x 2m3 tents with 4 x 600w super hps lights in each. The humidity is hitting the 90% mark in both tents. I am going to buy a dehumidifier.

The question is... would i be better buying two smaller humidifiers one for each tent.. these extract up to 600ml per day or buy a big one for the room that can extract up to 12l per day???

I am using air cooled lights that pump the air through a carbon filter and lights and out of the room.

Will the big one even change the humidity in the tent?

any help from anybody with reinvent experience would be appreciated.

Are you pulling air from the room the tent is in? Then I would just use one. Why not try pulling air from outdoors. This might be the better solution.

What's the temp with the lights on? And the humidity is at 90% with them on? Woah.....

I am in the same situation except for I only have 1 tent and veg in an open room. I use just one big one and it does the job!

thank you. i take it you have it sat outside the tent