Actually very few people are using the incandescent bulbs as LEDs are brighter, last longer, and are cheaper. I have seen the 6V/40ma bulbs on Mouser with the cheapest around .30 per bulb (If you are going for the authentic movie feel and look). The schematic on page 5 is geared toward LEDs as opposed to page 1 that is geared toward the incandescent bulbs.Thanks for the suggestion; I didn't even think to check Mouser. They no longer stock the E-5 or midget screw bases anymore either, but they do at least sell a wire terminal 6v/40mA bulb.
Going for the accurate movie feel and look is indeed my intention. I've soldered light circuits with LEDs for each of my packs in the past, but like you said, they're very bright (almost too bright, in my opinion). LEDs are also just too focused to look good, even with wide angle or jumbo LEDs. They're more energy efficient and longer lasting, but with 12v rechargeable batteries as cheap as they are and at only 30 cents a bulb, I think it's a fair tradeoff.
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