Try testing it. That may help you understand. A simple test really, a 60watt bulb in a 20 gallon tank. Then change the air temps by 10 degrees. You know, first at 60F ambient temp and check the temp of the bulb. Then at 70F (AT)and check the temp again, and keep going it at ten degree intervals.

After that, you may want to add some variables like raising the humidity and test again. Using the same approach. Raise it in 10 percent intervals. You can then vary the ventilation and test again. Then you will see a 60watt bulb can have a huge range of temps.

Then you may want to entertain what a lite bulb does. Cheers

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