Actually mine usually doesn't start with the glassy appearance; it starts out purple, but definitely not glassy. I tried another battery and it's still the same problem. I want to say it's the ballast too, but it's the same age as the bulb.
It should be noted that when I swing the light before the light goes out on me, it doesn't turn off and properly starts up. This empirical evidence leads me to believe it's something to do with the bulb. I also cleaned all the contacts but that didn't help much.