I Need Help Understanding Bi-Pin Sizes

Ok, I have some G4 D26 adapters. I understand that WA1111 and WA1185's will work with them. Now I'm looking for other bulbs too and I don't quite understand how the sizing works. It looks like there's two different size specifications on the same bulb, G4 and T2.25. I have also read that bi-pin bulbs can have pins of differing thickness and those pins can be closer or further apart so not every bi-pin will work in every bi-pin socket. Even more fun is that the glass envelope size appears to vary as well so not every one will work though every reflector.

If anybody can help me sort this out I'd appreciate it. I'm hunting for low output bi-pins and it would be very useful if I understood how the specifications work better.

My understanding is G4 has pins 4 mm apart.

I've got a slow connection otherwise I would do a search, or look up Litho123 as starter of thread (advanced search) as he has bulbs for sale.

Here's a link to Litho123's sale thread in the MarketPlace.

FYI, the next size up from G4 is G6.35. These are larger bulbs, typically 50W or more.

The T 2.25 refers to the size of the bulb, not the pin spacing. The G__ is the pin spacing in mm. Modified with an extra letter like Gx6.35 refers to the diameter of the pins and is beyond what I know off the top of my head :thinking:.

Thanks guys, that helps a lot! :twothumbs

I tried out a 1160 in my SuperStinger with Ultra head and the pins fit but I had to bend them in, and they seemed thicker than the stock UltraStinger bulb. What would be UltraStinger bulb be rated at, G? T2.25 (?)

Bill

Just got to thinking, the Stinger's are set up for minature bulbs, so the reason for the narrow spacing and thinner pins. The Ultra adapters make allowances for that.

Bill

Bullzeyebill said:

I tried out a 1160 in my SuperStinger with Ultra head and the pins fit but I had to bend them in, and they seemed thicker than the stock UltraStinger bulb. What would be UltraStinger bulb be rated at, G? T2.25 (?)

Bill

Just got to thinking, the Stinger's are set up for minature bulbs, so the reason for the narrow spacing and thinner pins. The Ultra adapters make allowances for that.

Bill

Click to expand...

Super Stinger, Stinger, Strion, TL-3 and many other flashlights with smaller reflectors use G2, T1.5 bulb and this is because reflector bulb opening can remain small for more reflection.
Percentage wise, this will reflect more light than this.
UltraStinger and Stinger HP bulbs are T2.5 bulb made by Carley with special plastic basing but still G2.