6AA 5761 maglite what other bulbs?

[bullettproof]

I have a 5761 6AA maglite I ordered one of fivemega adapters after the one I got with the light had some grounding problems. What other bulbs can I use being brighter or less bright. Give me some options

Heres my copper 2D
http://www.google.com/url?sa=U&star...itm0CQ&usg=AFQjCNFm5xFiquLR-ivFAxa_xz6mZ3i0pw

 

[PhantomPhoton]

You can use a Pelican Big D bulb as an ROP (no bi pin socket required).
You can use a couple Welch Allyn bulbs like an 1160 or 1111. There a 6V G4 bulb or two from Osram which I can't think of off the top of my head which can be over-driven pretty well @ 7.2V also.