I've always used a camera flash for glow discs though most recently I found a blacklight is more night vision friendly. For most discs these methods works great, but for Photon, not at all.
Discraft told me Photon had to be charged in sunlight or by car headlight for best results.
Just get an led uv/blacklight flashlight. they are cheap all over ebay and amazon, etc. it works so much better then anything else. The camera flashes and headlights and all that work, sure.. but nothing is better then the led flashlight. the majority of people @ my weekly glow league use it :P And you don't have to worry about the light coming off.