Here’s the somewhat scientific explanation of why LED lights are a better solution: L.E.D. stands for light-emitting diode. In this technology, light is created when the semiconductor diode inside the bulb is forward biased, or, turned on. Electrons recombine with holes in the diode to release energy in the form of light. The color of the light is determined by the semiconductor’s energy gap. Using this type of science makes these bulbs more energy efficient, longer-lasting, smaller, and more durable than other lights. Click here if you want to read about how LED really works.
These high-powered LEDs have become a major competitor to incandescent, fluorescent, and halogen bulbs in lamps and flashlights. For many applications, the LED bulb simply is the better solution.
LEDs can be significantly more efficient than incandescent lamps. An LED flashlight will have a longer battery life than a comparable incandescent flashlight. LEDs are also less fragile than conventional glass lamps.
Some top LED flashlights electronically regulate the voltage supplied to the LEDs to stabilize light output as the batteries discharge. By contrast, the light output of non-regulated flashlights declines as battery voltage declines.
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LEDs also have the advantage of maintaining nearly constant color temperature regardless of input voltage or current, while the color temperature of an incandescent bulb rapidly declines as the battery discharges.
Regulated LED flashlights may also have user-selectable levels of output appropriate to a task. For example, low light for reading a map and high output for checking a road sign. This would be difficult to do in an incandescent flashlight since efficacy of the lamp drops rapidly at low output.
LED flashlights may consume 1 watt or more from the battery, producing heat as well as light. Heat dissipation for the LED often dictates that LED flashlights have aluminum bodies to dissipate heat; they can become warm during use.
Light output from LED flashlights varies even more widely than for incandescent lights. “Keychain” type lamps operating on button batteries, or lights using a single 5 mm LED, may only produce a couple of lumens. Even a small LED flashlight operating on an AA cell but equipped with a power LED can emit 100 lumens. The most powerful LED flashlights produce more than one thousand lumens and may use multiple power LEDs.
LEDs are highly efficient at producing colored light compared with incandescent lamps and filters. There are color LED flashlights that are used for signaling, special inspection tasks, forensic examination, or to track the blood trail of wounded game animals. A flashlight may have a red LED intended to preserve dark adaption of vision.
An ultraviolet LED flashlight may be used for inspection lights, for example, detecting fluorescent dyes added to air conditioning systems to detect leakage. Infrared LEDs can be used for illuminators for night vision systems.
As you can see, when shopping for a flashlight for whatever purpose you plan on using it for, the top LED flashlights will meet your requirements and should offer you the best, most cost efficient solution.