There are so many different fills, but the following basic listing is approximately correct for most manufacturers as far as I know:

T12, T8 and T5 standard : Pure argon, or sometimes argon with a very small percentage of neon and/or helium to tweak the voltage slightly.  The main exception is the British T12 8ft 100W which contains approx 25% Krypton in Argon.

T8 European energy saving tubes: Nearly all 25% Krypton, 75% Argon

T8 European extra energy saving: Still mainly argon but with varying percentages of krypton and/or even xenon.

T12 American energy saving tubes: Nearly all between 10-40% Krypton in Argon.

T12 High Output: Argon, sometimes with very small trace of neon or helium

T12 Very High Output: Usually Argon with quite high percentage of Neon and/or Helium, to raise the voltage drop and facilitate high power dissipation from low current cathodes, while also improving efficacy under high discharge current conditions.

T5 Long High Efficacy : Usually pure argon for the short tubes, and argon with between about 3% and 11% Krypton for the longer lamps.

T5 Long High Output : Argon with up to about 40% neon or neon-helium added in varying quantities, for similar reasons as in T12 VHO types.

T5 low current emergency lighting types : Argon + small amount of carbon dioxide

In all cases the pressure is low, usually between about 1 and 4 torr.  There is not a consistent trend of pressure per lamp type, this can depend on the tube length / current rating.

I've noticed that the Philips SDW-T and SDW-TG, tends to rectify during starting, even when new.
Why this is happening?

I bought it at Machsanei Teura lighting store.

That sounds good. Where did you get your track light?

I've done a lot of hot restrikes with my Philips HID-PrimaVision PV C 70 /S CDM electronic HID ballast in my tracklight, and its ignitor still working perfect.

I love these things/  Got a better quality one a number of years back from off of EBAY.  It came with a crummy 6500K tube, so I replaced it with 4100K and I like it.

Personally I hate powder coat😬, especially when it starts lifting after a few years of the elements!
For all my lanterns in use outside, I have always used auto paint
My GEC on the front of the house was originally moulded in a creamy/beige fibreglass, which after years of use outside starts to expose the glass fibre in it!
I re-sprayed the whole thing using a ‘Rover’, (British car company), beige colour that was similar to the original GEC colour! 😀
It’s still looking like new today 😎

You can try. Remove the front cover so the tube is not enclosed, it will run much cooler. And add a reflector inside to cover all plastic surfaaces exposed to he tube. This can be with Aluminum foil glued in, i wonder how reliable/long lasting would be just spraying its insides with bright metallic color or similar spray. (Disassemble and mask it properly)

Asking because I need to redo the paint job on my OV-25. Going to go hammered silver color cause that is the original paint that Westinghouse used. Is it a good idea to do that?

If you'd like to actually see the unreleased Tru-Tone products, see Dan Neuman's video.