[etiam]

I'm certainly not a physical chemist, but at that sort of energy levels wouldn't it rather be liable to drive the gas mix towards some sort of equilibrium?

I'd imagine it breaks down molecular oxygen (some of which goes on to form ozone), and it breaks down ozone (some of which goes on to re-form ozone).

At any rate, that seems like altogether too radical to be desirable near living creatures whose well-being one cares for.

[lazide]

Yup, and the paper I linked has some detailed analysis of some scenarios. In some cases (particularly bad mercury vapor lamps), it can produce dangerously high ozone levels (50x EPA safe working limits).

In others, no foreseeable issues even if run 24x7.

So, uh, maybe don’t buy cheapo units off Amazon unless you have some way to see/test what they’re doing.