On 2017-03-08, Doug Landau wrote:
My taillight hopped off 5 miles from home at the end of a 500 mile tour. It was dark and the road got narrow and unlit so I strapped my flashlight to the left seatstay, pointed down, illuminating the roadway.

Looking at the result, I thought it did an absolutely great job of improving (creating?) visibility.

A useful product? A legal product? A marketable product? I have searched a few times over the years but found no mention of such a product,

Doug,

I think Rock the Bike were the first to popularize that, with their
Down Low Glow: http://rockthebike.com/the-down-low-glow/

Under some conditions it's excellent for visibility--but it's
always a lot of fun at parties.

--
Gregory S. Sutter Mostly Harmless

http://zer0.org/~gsutter/