Also to mention, water loss will be much higher from heating caused by light, or heating from a heat mat, than heat that is even and circulating within a plant enclosure.
If the plant is a warmer temperature than the surrounding air, water loss will occur. This is the same principle that freeze drying works through.
Cold air holds less water, so when that air passes over a warm surface, heat is transferred to the air, and along with that heat moisture is carried away because the warmer air can now hold more water vapor.
However, if the warm air is relatively saturated with humidity, and it is not cooler than the temperature of the plant, than it will not carry away much moisture or have a drying effect.
A potential disadvantage of excessive light is that it is effectively beaming heat energy directly onto the leaves. This can put drought stress on a plant.
This is a particular consideration because plants growing in containers have smaller root systems without as much access to water.