An Introduction to Flashlights

eiodotcom —  July 10, 2012 — 2 Comments

Today’s Eio post is on flashlights.

Flashlight overview

Flashlights are common household objects. It is a hand-held portable light source that is usually powered by batteries. The light source usually comes from a light-emitting diode (LED) or an incandescent light bulb.

Wisegeek lays out the differences between incandescent flashlights and LED flashlights:

Incandescent light used in traditional flashlights utilizes a filament wire encased in a glass vacuum tube or bulb. When electricity is supplied to the wire from the batteries, the wire glows with heat that produces light. The heat, however, is not only lost energy but it eventually burns out the wire and the bulb must be replaced.

A LED flashlight harnesses light created by an entirely different process. Two types of semiconductor materials are used in a LED: one type that has an abundance of free electrons and the other that has a deficit. When enough energy is supplied in the form of electricity, a threshold is reached that pushes some of the free electrons in the abundant material to jump to the attracting material. When that electron takes its place in the new material a photon or particle of light is released.

Special Uses

Some forms of the flashlight have been adapted to meet special uses.


Headlamps, or flashlights built into head-bands or helmet mounted, give one light when their hands are full. These are especially useful for miners, campers, mechanics, or other jobs that require hand-free environments. Here are a few examples on our Eio website:


This product is powered by 3 white LED bulbs. The LED has a long-life of 100,000 hours. It comes with adjustable headband, up/down adjustable headlight, has a focus control from spot to floodlight, and has three modes: 2 LEDs on, 3 LEDs on, or halogen lights on.


This headlamp can be worn both on one’s head, wrist, or clipped to the front of the shirt. The LED has long-life and is ultrabright, has a focal lens, and has an adjustable and removable headband with fixing clip.

Large Flashlights

Large flashlights generally come with bigger batteries, bigger light bulbs, and more power. They are able to project light brighter, farther, and wider than other flashlights. For instance, some are used for deep sea diving to see in the murky depths of the ocean. These are often waterproof as well.

Pelican 4100B

This productis submersible to 500 feet (150 meters) as it is the diving version of the King PelicanLite™. Features include a dual filament Xenon back-up safety lamp, operating during 30 hours each filament (60 hours in total). It includes a patented shock absorbing internal battery module that protects 8-D cells Alkaline batteries (not included) from hard abuse.

Inspection Flashlights

Inspection flashlights are used to search or inspect in small, tight spaces that normal straight necked flashlights cannot reach. These often have bendable goosenecks to get light at different angles.


This gooseneck flashlight dimensions has 12.60″ gooseneck length with collimator which provides more focused beam distribution. It provides momentary or constant illumination and its DC-DC regulator maintains maximum light output throughout the entire battery life. It comes with clip attachment and has battery life of 2.5 hours.

Mechanical Power

Mechanical powered flashlights use a crank or winding tool that is connected to a small electrical generator. The more you crank or spin the tool, the more electricity gets generated by the tiny generator within the flashlight. This type of light is optimal when there is a natural disaster or other crisis when one finds themselves without electrical power and without backup batteries in hand.


This flashlight comes with mobile phone charger, flashing warning light with alarm and counterfeit money detector. Rotating the crank for 1 minute will give up to 30 minutes of continuous light. For charging your mobile phone (one adapter included): 3 minutes of cranking will give you up to 2-8 min. of talk time and 20 – 50 minutes of standby time. It has a 5VDC or 8VDC output, and the recommended rotation speed for recharging: 120 RPM, 1W output power.

See also:


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