Sorry Jerry I was going to post more details of the bulb but had to check out the insides of the old eyelids.!
It's this one.
https://www.ebay.co.uk/itm/2x-4-Side...72.m2749.l2649 You can put one in your bike and give the other to a mate.
As mentioned it is wired in the red box so that the dip is on all the time and the main is switched. That might account for the full spread of light. I wanted to try this out anyway by jiggering with the wiring on the bike, but now I don't need to.
There are loads of these H4 LEDs on ebay, nearly a matter of putting a pin in the page, as it's a bit of a minefield.
