I bought my first LED flashlight nearly eight years ago. It was a small keychain using a button-cell battery. Since then, LED flashlights have evolved and today's models have brighter lights using more LEDs.
Light-emitting diodes or LEDs are solid-state transistors which give off light when power passes through them. But unlike incandescent lamps, it has no filaments, and no bulbs. It doesn't burn, nor generate much heat. And best of all, it eats up a small amount of energy.
The small energy footprint makes the LED flashlight a very novel approach. It doesn't require a large power source to produce light and it doesn't generate lots of heat either. And since it's a single diode, it has a long life span.
Although normal LEDs come in a wide range colors, the LEDs used in flashlights tend toward a bluish tinge. This is not really a obstacle to having a bright flashlight. In fact, there are now small projectors which have LEDs for the lighting element.
The titanium LED torch are available in an array of sizes. There are the thumb-sized models which are smaller than a hand, with larger units using banks of LEDs. Using arrays LEDs, the size of a lighting unit can be as large as any normal flashlight, with a variety of designs. There was even one unit which make use a circular group of LEDs for a flashlight lamp inside the reflector unit, which also had a rectangular array on the side but without the reflector unit. This would be good when camping, replacing portable battery powered fluorescent lamps.
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