Flashlight, Flashlight

Some types of flashlights can be powered by hand-cranked dynamos or electromagnetic induction.

Flashlight hobbyists often modify Maglites by replacing the bulb, reflector, switch, and batteries with more powerful options, producing much more light than a stock Maglite.

By contrast a non-regulated flashlight becomes progressively dimmer, sometimes spending much of the total running time below 50 percent brightness level.

While lower-power LED flashlights generate little heat, more powerful LED lights do generate significant amounts of heat although not as radiant energy, as the semiconductor junction inherently dissipates heat. For this reason higher-powered LED flashlights usually have aluminum bodies and can become quite warm during use.

However, they are more expensive and are usually rather bulky. An example of an HID flashlight is the Surefire Hellfire Weaponlight.

Source: Wikipedia > Flashlight