LED

LED Flashlights
       

                           The flashlight delivers better performance, longer life, and more reliability. The invention of the handheld flashlight over one hundred years ago and its subsequent improvements ushered a new era of convenience and safety to anyone that needed to light their way. Over the last decade the flashlight has been transformed by a technologic revolution. The use of LED technology in place of the standard incandescent bulb has resulted in a handheld lighting device that is brighter, longer lasting, and more versatile. LED is the new champion of flashlight technology due to the combination of standard flashlight technology and LED flashlight technology.Standard flashlight technology mostly uses a tungsten filament incandescent bulb which creates light by heating a suspended thin filament until it glows. This creates a great amount of heat while producing a yellow light. This is the inefficient process and requires heavy battery.Also the suspended filament is very fragile and prone to breaking. Additionally, the light beam put out has varying levels of illumination from the center of the beam to its edges. Another disadvantage of the standard flashlight, is that the light output decreases as the batteries are drained reducing effectiveness over the life cycle of the cells.

The Light Emitting Diode (LED) on the other hand, uses a charged semi-conductor material wrapped in a clear solid resin to create light. The light from LED is created when an electrical current changes the state of the material by an exchange of electrons. This process requires less energy and it is efficient. Its efficiency  results in a light that is much brighter and more evenly distributed than a standard flashlight that allow the beam to be seen much greater distances. In addition, the light produced is a white light that more accurately mimics daylight allowing for greater detail in the light zone. There is a solid resin that covers the LED. That covering protects the LED. Its shockproof design vastly increases its durability over incandescent bulbs with their fragile suspended filament.

Although it is hard to make a fair comparison between lights of different type and configuration, a general result of the efficiency of LEDs gives them an output of around 25-60 lumen per watt while an incandescent bulb will produce between 14-17 lumen per watt. That means that for the same battery input, LEDs will convert on a more efficient scale. The durable and efficient nature of the LED unit results in battery life that is ten times greater on average over standard flashlights. Some LED flashlights also utilize electronic controls that provide multiple levels of light depending on need which increases efficiency and further extends battery life. Also, many LED Flashlights have controls which maintain full light output up until the very end of battery life. Another great advantage of this greater efficiency is that effective LED flashlights can be made much smaller than standard flashlights and still produce practical effects.

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