This popped up in my YouTube Subscriptions. These lamps are apparently supposed to simulate sunlight in the desert. Are these really "unhealthy"? Apparently, they are meant for certain reptiles.

https://youtu.be/yyygYdSOpi8

Apparently they produce a lot of UV which is beneficial to reptiles but NOT us ! 

The UV is supposed to kill germs on the reptile skin so prevent problems like fungus growth or so, but not yet causing too much to harm the reptile itself, so the exposure is important.
Reptiles can not sense the UV, but they evolved to regulate the exposure by the IR heat they do feel and which does accompany the UV with rather fixed ratio in the natural desert sun light. The evolution then made themto expose themself on the sun according to how much heat they feel, so in fact regulate their UV exposure that way.
But because that exposure control mechanism is indirect and evolved around natural sun spectrum, in order to be effective and to not harm the reptiles, the lamp has to emit exactly the same ratio of IR heat vs UV radiation power. That is the reason why SBMV based lamps are popular for this, as there the ratio is very close to ghe natural sunlight within the same lamp, so there is pretty large tolerance in how to install it and still allow the reptiles to get the exposure they need.

The same skin cleaning mechanism works on human too, but human skin is way more sensitive, so there needs to be really good indication for such tratment and it should be well controlled (really exposing only the treated area, strict doctor supervision,...).