The ignitors are indeed dead. No HV pulses at all. I've tested with a known good 400W HPS bulb too, nothing. I think the failed ignitors is the reason why these were once taken out of service.

Actually, Cree Lighting itself is in furlough... ADLT has paused operations for over a month at this point. Wawa, a local convenience store chain has been using Cree since the beginning (first BetaLED, then Cree- most notably, the Edge series of luminaires) has now switched to Acuity for sourcing needs. Instead of Cree for the canopy lights and parking lots (as was the norm), they are now using Lithonia / Acuity, specifically the D-series. I doubt they'll switch back, even if Cree resumes normal operations.....

Considering I haven’t seen any of their LED lamps in stores for about five years now, it makes sense.

I think the only thing that makes their name still worth something is their LED luminaire division which I believe they still own and haven’t sold it off yet, but even then, I’m not sure how much it’s worth in people’s eyes. I haven’t seen many new installs of their luminaires in recent months either.

I have both 70W and 250W versions. From the spectral captures I can say that smaller lamps definitely work at higher pressure and so have their Na line more widened and somewhat shifted to red. So there is less need to add Li to get the color desired.

CREE was a big name may be 15 years ago when they (together with Nichia at Japan) first started to make practical white LEDs. Now there is already a myriad of competing Chinese (and Korean, and Japanese) manufacturers, so no wonder Cree is starting to dissolve in some larger businesses...

@RRK
Yes of course, I know I was just talking about glassworking before, but my hyperfixation has suddenly shifted as it often does . In my opinion acetylene is kind of obsolete for most purposes, but that is apparently a controversial one.

Another thing that I have recently discovered is that South Korea seems to apparently have an abundance of clear mercury vapor lamps including 250W versions. I am happy to assist with getting them imported to Canada as they are so plentiful in that country and should have the same electrical characteristics as our 250W H37 mercury vapor lamps.

https://m.bdlighting.co.kr/product/%EA%B3%A0%EC%95%95%EC%88%98%EC%9D%80%EB%9E%A8%ED%94%84-%EC%A0%84%EA%B5%AC-100w-200w-250w-300w-400w-1000w/391/

https://m.victorylighting.net/product/%EA%B3%A0%EC%95%95%EC%88%98%EC%9D%80-%EB%9E%A8%ED%94%84-100w200w250w300w400w1000w/97/

Another option that I am also considering is that I could import a case for myself and a case for you and would it be fine if I can exchange one of those lamp cases in exchange for 250W H37 mercury vapor lifeguards in /DX form?

Very fortunately, for glassblowing, you can readily use natural gas/propane + low pressure oxygen from a concentrator, which removes most of the risks.
Soft glass is workable with safer gas + air. Acetylene is mainly reserved for metalworking, and even there are safe toys like MIG/TIG welding.

@Medved
Thank you so much! That definitely makes sense now, and now that I looked up pictures of acetylene tank valves they do seem pretty cramped inside, with all of the acetylene gas being pretty close to the thermally conductive brass.

Hmm, I didn't know Cree still made household LED lamps to be honest. I remember they used to be common in Home Depot in the 2010s but I haven't seen their products for sale more recently.