Yes, Comet Pinball carry’s them, however they are not very bright or affective on the Revenge from mars I tried to use them on.

I’ve heard it explained they’re not “true blacklight” I don’t know if it’s possible to make blacklight LEDs that are also powerful

I believe they are in the Ultraviolet spectrum, so they can use the Black Light moniker. But, they are probably above 400nm so they are more violet than UV. But, for what I would call a "true" UV LED light (365nm), I've not seen any in 44/555. But, I've seen and do have some true UV LEDS. I think they are a COB or some other format.

From http://glow.glowinc.com/black-lights-1/

Ideally, for black lights, you would use 365 nm LED’s. Therefore, you would assume that manufacturers of black light products would stick to that wavelength. Why do they not do that?

A 365 nm LED is only about 20% efficient as a 405 nm LED. Individual 365 nm LED's are also relatively expensive. Therefore, manufacturers need a massive number of expensive LEDs to create a decent LED Blacklight. Furthermore, light from true 365 nm LED’s is not visible and therefore uneducated consumers are not happy with the 'light output'.

Interesting read.

Yes there are some in the spotlights on Cosmic Carnival to illuminate the molded toys on the playfield

2275DF4A-1BD9-4970-A5A4-25549D73D17E (resized).jpeg

55D0829B-7668-4B52-A1F6-B058ED9584FD (resized).jpeg

DA043EE6-0D8F-4305-A7DC-8C963B2408CA (resized).jpeg

I've used the Comet UV bulbs and they do make UV reactive colors glow as they should.

Flex: https://www.cometpinball.com/products/1smd-flex
1 SMD: https://www.cometpinball.com/products/1smd-bulbs
Flux tower: https://www.cometpinball.com/products/flux-tower
4x1 tower: https://www.cometpinball.com/products/4x1-tower