- What is a LED?
Technically, it's two metal plates with equal yet opposite electric charges separated by a dielectric forming an electric field. Basically, it can be thought of as a simple rechargeable battery with several advantages.
- Why do some flashlights have funny color lights?
These are either older models manufactured when white LEDs cost more than other colors or specially made units designed for military and aviation purposes where white light would cause a temporary reduction in low-light or nighttime vision.
- Are these as good as my rechargeable flashlights?
In many ways, they're even better. For example, during extended power outages, once a rechargeable flashlight is drained, you're out of luck, but with a removable battery flashlight, you can recharge it with a few flicks of the wrist.