Very cool. Reminded me of this post about Sodium Vapour Lights used in old school special effects chroma keying.

https://news.ycombinator.com/item?id=39962615

That one we'd like to do at home, if I could get my hands on an LPS lamp, there's a lot of wrongly marked bulbs out there, afaict.

Just look in a growing shop. Isn't that what they use?

No, they used HPS. Although now replaced by LED.

Ah, fair enough. Doesn't seem so hard to find a legit one though. Searching for Philips SOX gets me a lot of results for example.

Yeah, that's cheating :)