Most tackle shops carry both types. The battery powered tip light is simply an
led powered by a watch type battery with a simple on off switch. The tip
light can be whipped to the tip of the rod.

Usually available in either red
or green. Chemical varieties are cheaper but have a limited life. Once
activated, they cannot be turned off. These should be fastened to the tip
with eletricians tape or similar as you will need to change them on a regular
basis. My choice would be the battery powered version.