Substitute for a G2.5 lamp?

For Christmas, I got a light that uses a G2.5 lamp. I didn't know "G" lamps also come in pin-size 2.5.
It looks like this:



I want to use hi-cap NiMH's and a lamp with a high amp rating in this light. The G2.5 seems to be practically impossible to find (where I live anyway) and I don't know if it's available in hi-amp either, so I'm looking for a substitute.

Anyone have any ideas?

I might also experiment with overdriving a three-cell lamp (like the Tec 40 trick), but that would be more for fun.

Thanks for any help you can give me.

Greetings,
Velcro

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The 4.8 mm bulb envelope circumference is the same as exists with T-1 1/2 bulbs.

Welch Allyn's T-1 1/2 bulbs have 3.05 mm pin centers with .203 diameter pins.

Carley's T-1 1/2 bulbs have 1.270 mm pin centers with .508 diameter pins.

The wide G2.5 pin spacing makes it non-interchangeable with the alternatives that first come to mind.

...Moved to modified...

--dan