Have you got a BS kite mark or equivalent EU standard on your lights?
when I started night riding IIRC you could use a kite marked everready nightrider or similar which weighed a tonne with their D batteries, ran out of juice after 1 or 2 good rides (apparently audax riders needed to take spares for a single event) were pathetically underpowered and often ejected from their brackets
or you could get an LED flasher that weighed less than a mars bar lasted 200hours of riding and could be seen from space, but wasn’t legal.
I’ll take visible over (badly done) legit any day, but both would be nice.
What involves getting kite mark or similar? do the manufacturers have to pay a wedge or do they just submit sample for testing?