Gordon to the best of my knowledge all dedicated LED headlamps are essentially sealed units albeit with considerably greater life than filament bulbs.

Keith as far as I can see the Tribar headlamps you refer to don't come with a light source although apologise if I have this wrong. You fit either a halogen or LED bulb. Not sure of legality of latter as a unit though.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone