This is such a good idea. I’m impressed.
On his blog, Jan announced the availability of new red LED lights you can screw right into a vintage taillight. Old-style screw mount, new-style LED light, with no rewiring. Wow.
Rather than remove the vintage taillight internals and carefully repack the light with modern LED taillight electronics, you simply screw in the new bulb and ride away. It even includes a standlight function, build into the screw mount.