As for bike lights, I have three Cygolite Expilion lights that I use on my bikes. They kept making brighter lights and I kept buying brighter lights. My collection includes a 250 lumen, 400 lumen and 800 lumen Expilion lights.

Appears their webpage is down right now, but another webpage shows a 750 lumen light that looks identical to all three of my lights:

http://adrenalineworld.com/cygolite-...ble-headlight/

And they are all USB rechargeable.

The copy says the battery lasts for 22 hours in "daylighting" mode. I'm assuming that is the strobe setting that should be used only in the daytime by cyclists. Using strobe at night could probably incite epileptic fits with some people.

Not sure how and where one could be mounted on a glider.

But they make GREAT headlights for riding the bike at night and for giving car drivers no reason for not seeing you day or night.

Ray