No its the direct heat on top of them and dehydration effect, they went into it further than that but basically basking lamps concentrate all the heat on top of the carapace where as in natural sunlight they heat up more evenly and deeply in the core.
Thats why Ive always preferred the small warming coldframe areas I have in the garden, they come and go in them things and get toasty warm more evenly the downside being that they got no UV but now changing the poly carb top for this clear lumisol they get the best of both worlds. I did mention on the TT a while ago about using small warming area coldframes in direct sun with the back up of a tube heater on a thermostat not be a better way to warm them up than basking lamps. I still think this is the way to go.
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