I've got a set of Nightsun Team Issue dual halogen lights on my mountain bike. If you don't remember these, they were the cat's meow for powerful, rugged rechargeable bike lights - 20 years ago.
Today, they are still pretty bright, but not very bright; the beam pattern is too diffuse; and the color of the light is much yellower than we're used to.
They are like this: http://www.night-sun.com/htmldocs/team_issue.html
The battery is 12v. One bulb is 10 watts, the other is 20 watts. They are two-pin halogen bulbs with reflectors. They look like
My question is, can I convert these to LED? Find a powerful LED that will fit in the housing? How would you approach this, if you had a mad hankering to tinker?
The reason why I don't simply dump the old Nightsun, is because it looks correct with the bike, which is an early '90's machine. I like the retro vibe.