With the help of the fans, you will also be able to adjust the temperature somewhat.
When using 2 fans, normally you can force cirulation of air by putting them on the outmost side, one blowing and one drawing.
If you need more warmth, you can use the heat emitted by the lights, simply let them both push the warmer air in.
The other way around, you can let them both draw the air to have it cooling somewhat.

So playing with the settings of the fans, especially when you put the adjustables on top, will help you adjust the humidity, air flow and temperature.
Just tweak them untill you have satisfying values.