If home made is acceptable...
Original Ever Ready used 2xD cells = space for 4xAA cells, resistors, switch, 3 red (rear) and 1 white (front facing 'marker') LEDs.
Not exactly l'eroica, but an easy conversion for '70s period machines?
@MrE started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If home made is acceptable...
Original Ever Ready used 2xD cells = space for 4xAA cells, resistors, switch, 3 red (rear) and 1 white (front facing 'marker') LEDs.
Not exactly l'eroica, but an easy conversion for '70s period machines?