I just want to clarify, especially for those with very smart cats , I do not place my head on the vacuum glass and point my eyes into the light source! Given that the spectrum of these lights is very close to daylight it is not unreasonable to think that they may not be dangerous to be exposed to (indirectly to the skin or eyes). This particularly for relatively small exposure times. Yes they do contain a significant amount of UV, just like the sun. Indirect exposure to the skin should not be dangerous. I guess I was asking about general practices among users of these machines. Thanks for all your suggestions.