Ah, I see. Probably not then.

I have found a 7.5 volt transformer in my stock of extra parts. This light works perfectly upon installation, without any overheating or odd behavior. I will go head and install it permanently after some extended testing, but I think it's pretty much good to go!

Thank you so much for the help!! Another vintage emergency light saved from the trash!

Because it just likely uses the same style pump.
It would make sense, if it has to pass the water through some denser filters, which pose considerable backpressure.

Yes. For lesser lamps this is a messy fog on the internal surface of the bulb. Definitely a product of filaments coating deterioration.

I have one filament LED bulb in my house in particular that I have a question about. It is mounted horizontally, and visible in the lowest part of the envelope is what appears to be a drop of some sort of very thick but very clear liquid with very low surface tension. It is a very small amount, I first thought it was just an artifact in the glass, but I have confirmed that this is not the case.

Since the bulb is mounted horizontally, I unscrewed it just about 45 degrees (not enough to be loose, but enough to move the drop away from the lowest spot). The drop did not move, it stayed stuck to the side of the glass where it was before. But when I looked at it the next day, it had re-settled into the new bottom of the lamp. So I re tightened it an just to see the same happen again the next day.

So whatever is in there is a very thick liquid. One of my guesses is that it is some sort of thick silicone oil (or thin silicone grease) that is a byproduct of the silicone phosphor coating on the filaments. And yes this filament bulb is in a hermetically sealed glass envelope, so I highly doubt it is moisture ingression.

Any ideas? Has anyone seen this before? I don't have a picture unfortunately but I can take one next time I am home if I remember.

 I'm gonna start by saying that this was actually MY FAULT !  I recently came across a 100w /DX , small etch Westy MV lamp advertised as NOS for sale on eBay . WELL , the Philips/Westinghouse HPS sleeve it was in didn't grab my attention as it should have . What DID catch my attention AFTER I made the seller a offer of which they accepted and I paid for it was the seller's photo from the top of the cleartop lamp which CLEARLY SHOWED the well blackeded arctube !!! DOH ! The lamp arrive the other day and surprisingly it DOES work but is dimmer than a 50w MV . DOH ! again !!

 Lesson learned !!! Don't get caught up in finding a "cheap" desireable NOS lamp !! LOOK CLOSELY AND CAREFULLY AT ALL PHOTOS ! I can't blame the seller for this as all was CLEARLY OBVIOUS had I looked carefully , closely and objectively at the seller's photos !

 Before anyone tries to blame the seller , they have NO other lamps for sale so I highly doubt they knew the difference .

 I just bought a N.O.S. 2016 1000W Wide-Lite F-series reflector housing assembly . All I need now is to buy one of the many 1000w Wide-Lite ballast assemblies on eBay and I'll have a complete fixture !

 .....  ... I don't know as much about the LPF Rapid or Trigger Start single lamp ballasts, so I don't know as much in terms of
the wiring or the sockets. I've already went ahead and bought sockets. Not much money lost there, since I'm about to sell my sportcar. lol

I assume I've got to change out the "cut off" sockets

You can actually just take the 2 white wires on the side of the lampholder where the cutout thingie is and connect them together...then you have a "normal" lampholder. .lol.

Last light-related thing I did was to install a 2xF17/F20 striplight in the garage(currently running a pair of F20's).
Also replaced a EOL F96 slimline lamp there while I had the ladder out.