I use mine for inspection, and the lights, and spare cells, etc, are in my truck most of the time.
I've never had a problem...but I imagine that its possible.
I use coolers to keep the stuff in, mostly because they are the right shape and easily carried...and, they temper the temperature fluctuations. I have never added blue ice, etc, to cool them...or heat for the winter either...they suffer through what ever the truck interior goes through.
I do tend to crack the windows, etc, if its hot/use sun shades...and other measures to address the truck getting hot, but because I don't like it to take a long time to get cool when I get back in.
As mentioned, just like anything else that is chilled, and then brought into a warm humid area....it will encourage the formation of condensation. Now, this should be on the OUTSIDE of the light...unless there was moisture IN the light to start with. (They are pretty well sealed typically).