Hello James,
Thank you. If I find time ill dig it out and will put a table together and publisch here.

Best regards,

Alex

I’m not sure a table has been published, but in the ANSI standards there are datasheets for each lamp type which include this information.

Sounds like some kid who doesn’t know better. It’s common in other hobbies such as tornado siren videos. I don’t think he’s on L-G or such as we haven’t had something like that here as of recent. I think all you can really do is ignore them, or remove their comments to prevent to spreading of misinformation.

YES! I get what your talking about! I'm in the logo community and it is full of these kids who beg for TCF logo models (or logo remake models in general) and then if they don't get what they want, then the kid would get angry!

Hi in the UK Mercury Vapour lamps were changed here in the UK to Sox lamps in the 1970s energy crisis but some Mercury  vapour lamps were still used in the 1990s in some parts of the UK kind regards Bob 

We ban because we can...

This ban actually applies to all mercury vapor ballasts in the USA. They were banned as a result of an “energy efficiency” initiative as far as I know.

Why were the 175W H39  mercury vapour ballasts banned ? kind regards Bob

Let ChatGPT to write an essay about American street lighting...

Hi yes you are correct you are lucky been in the USA as a 175W CWA Autotransformer is an excellent  choice for the Thorn 200W SLI/H HO lamp kind regards Bob

To use a CWA ballast without an ignitor, you would need to use a 175w M57 probe start metal halide ballast because they  have a higher OCV compared to 175w H39 mercury vapor CWA ballasts. If a 175w H39 mercury vapor CWA ballast was to be used with a Thorn 200w SLI/H HO low pressure sodium lamp, you will probably need to get a 90w SOX low pressure sodium ignitor and have it wired in parallel with the lamp, but use an incandescent lamp or resistor in series with the ignitor to keep it safe from excessive current. However, 175w H39 mercury vapor ballasts are not recommended as they have been banned in the USA since 2008.

That's what I use. running from a 120V 60Hz inverter.