Prompted by the hi vis thread and a few glasses of wine I spent 2 minutes in the garden last night seeing where you have to be to notice my two lights.
What I found:
The Fenix L2D is a very directional laser. That is OK - I helmet mount it, for my benefit. But, if I'm not looking at you then (more or less) you won't see it as a light.
The Cateye EL510 is good for about* 60 degrees from the front, with a much reduced light round to 90 degrees.
* = guessed after drinking, if I get round to measuring properly then I'm sure this will be proved inaccurate.
I know that wide angle bright LEDs aren't such a common component, which is probably a factor here. Maybe multiple LEDs improve things - or are they just to get more light out of cheap components? I suspect well designed mirrors and lenses are key though.
Does anyone have a sensibly bright, sensibly priced light that has close to +-90 degree (to the side) visibility, at close to front-on brightness?