Ole, your photos will work if they are in your photo section under a particular heading. I recall the photos.
You mentioned the use of a battery on your LED conversion. If they're using incandescent lamps on production machines, they may be using them directly from their engine-driven AC magnetos. If LED's are wired this way, they will exhibit a frequency-driven flicker, as well as poor illumination at lower RPM unless a battery is used.
In this case, it is preferable that the magneto becomes a battery charger, and in some cases, will require a voltage regulator and in all cases a rectifier.
Or the magneto is discarded/not used, and a LiPo, etc. is used to power lamps, and recharged from a wall socket.
Old news, but we have a lot of new people here these days.
EDIT: Here is the link to Ole's most excellent write up on DIY LED Lighting.
https://www.oldminibikes.com/forum/...-diy-led-lighting.html?highlight=LED+headlamp