Guess what light this is...

[Mike]

@ aaron, close, CWI was the ballast.

Xenon Strobe light?

ugly color. Is the easiest for astronomers to filter out.

[A_lights]

correct!!!

LPS

Has a orange glow and used in older surge protectors, some flicker a lot

[GEsoftwhite100watts]

neon indicator glow lamps
Starts out dim pink, then gradually changes to purplish-white-green

[joe_347V]

/DX phosphored mercury vapour.

Lampholder size in between medium and mogul.

[GEsoftwhite100watts]

 Never heard of such a thing...
Bulb in at a 45 degree angle and buzzes.

[A_lights]

Some type of MV yardlight

Long lamp that can kill ballast when it fails. .the fixture is 2 lamp

[GEsoftwhite100watts]

75w F96T12 slimline

[A_lights]

Yep!

Purple colored fluorescent lamp

[GEsoftwhite100watts]

Grow-Lux
Are preheat but sometimes came with rapid start lamps which worked fine regardless

[Mike]

shoplites?

This lamp is always 5ft long reguardless of wattage. Not a single person in the lighting community has layed eyes on a 100W version of this lamp.

[GEsoftwhite100watts]

No, circline adapters
I have absolutely no idea to be totally honest...
Brand that almost always uses cathode guards on their florescent tubes

[joe_347V]

This lamp is always 5ft long reguardless of wattage. Not a single person in the lighting community has layed eyes on a 100W version of this lamp.

I'm guessing it's the elusive F100T17 lamp. I think someone on LG posted a picture of what might be one though.

Fun facts about T17s, the five foot versions came in four wattages, 40w instant start, and 85, 90, and 100w preheat start

A three foot version was also made but was discontinued in the early 40s so they are VERY rare,  I only know of the one posted on LG.

Brand that almost always uses cathode guards on their florescent tubes

Philips


Now speaking of rare fluorescents would someone guess what this is:

[GEsoftwhite100watts]

No idea...
One key component stabilizes lamp current and THE longest lasting lighting situation I am aware of is a 175w Westy LifeGuard running base up one one of these ballasts-easily 300,000 hours!

[joe_347V]

It's a Type RF fluorescent VERY RARE and I don't think anyone on here or LG has one



It's around 5' long and uses 85w, it was self rectifying and had one end with two filaments, I'm not sure when were they last used though. 

I'm guessing ballast?


Commonly used in cold areas, rapid start only.

[GEsoftwhite100watts]

I meant CWA ballasts...
HO florescents...
Sometimes isn't the remost reliable thing when it comes to starting lamps and the cathodes just glow dimly unless you flick the switch on and off multiple times or touch the tube...