There are a lot of commercial ACL LEDs available. They use 10% of the power of xenon flash tubes and they have a better form factors. That makes them a lot more practical for gliders

http://www.aircraftspruce.com/menus/...g_landing.html

http://www.aircraftspruce.com/menus/...ng_beacon.html

My favorite at the moment is http://www.aircraftspruce.com/catalo...tingBeacon.php