How to get 12v from a 6v power source?

Hello. I have a 1982 Honda C70 Passport, it has a 12v battery. I changed all the blinker lights and the brake light to 12v led lights. The head light on the other hand is a 6v 25w light and runs directly from the power created by the engines stator. I was wondering if it's possible to boost the 6v to 12v? I also have looked for 6v 25w led headlight bulbs, but it seems 6v are in the past and I can't seem to find any for sale. The only option I see is upgrading the engine or hooking the headlight to the battery power, but I fear this will kill my battery faster and this isn't how the manufacture intended it. Any ideas as to get the 12v led working from a 6v power source? Thank you in advance.

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