These modules are being widely sold on eBay, both inside cases with fans, or in their bare form.

It's worth mentioning that these units shouldn't really be used outside a grounded metal case for a few reasons:-
They operate at very high voltage. Around 4kV and probably in the region of 30mA.
They will get quite hot in use. Possibly too hot without fan cooling.
The failure mode is sometimes a sustained hot electrical arc.
They will almost certainly emit huge quantities of electrical noise.

The level of ozone generated, especially with a fan, is huge. They are not suitable for use in small rooms other than for shock ozone treatment. I'd categorise these as industrial modules.

The circuitry was surprising. Very reminiscent of an electronic halogen driver. I'm wondering if this is the same circuitry used in electronic neon power supplies.

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