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
![Tongue :P](http://galleryoflights.org/mb/Smileys/classic/tongue.gif)
Now speaking of rare fluorescents would someone guess what this is:
![](http://i560.photobucket.com/albums/ss50/joseph_125ON/Gallery%20of%20Lights/Tube2.jpg)