There was an incident reported about a year ago (maybe more) over a certain bulb causing a dragon to constantly close his eyes (I can’t remember which brand it was sorry) so the owner placed his palm under the light in the place his dragon usually basked for around five minutes and he had a reaction that looked a lot like sunburn and rug burn.
I’m not implying that’s what your bulb is doing to your dragon but I’d check the reviews first to see if anyone else reported that happening to their dragon with this bulb, then try the same thing he did but only for 30 seconds or so and if you feel something happening to your skin stop and document it for the pet store to see, even if it is barely noticeable. If you’ve determined that is the problem take a video of your dragon basking under the light and for a maximum of 30 seconds, or until they run out of the light, so they don’t have a reason to reject you a refund on the light.