Flashlights are portable hand-held devices which emit light. These flashlights are usually powered by batteries and the source of the light comes from either incandescent bulbs or light-emitting-diodes (LEDs).
David Misell, a British inventor, is credited to have built the first ever flashlight in the 1890's. This early device featured a paper tube body, a brass reflector, an incandescent bulb and was powered by three 'D' batteries.
Parts of a flashlight:
Body: The casing that holds the different parts of a flashlight such as the batteries and the lamp (LED, light bulbs etc.).
Eveready advantage: Our flashlights comprise a range of body types which are strong and durable. The flashlights feature a range of long lasting materials and finishes such as Nickel-Chromium plated brass, powder coated aluminium, ABS (Acrylo Nitrile Butadiene Styrene) plastic and poly propylene plastic.
Contacts: A very thin spring or strip of metal (usually copper or brass) that is located throughout the flashlight, making the electrical connection between the various parts - the batteries, the lamp, and the switch. These parts conduct electricity and hence, complete the circuit.
Eveready advantage: All the elements of the contact are rust proof and feature brass or nickel plated steel or galvanized / copper coated steel. The majority of the contacts are made out of brass while non-brass contacts are plated and tested by standards which are superior to IS.
Switch: This button ensures the activation of electricity within a flashlight. When it is in the 'ON' position, the flashlight emits a light. When the switch is in the 'OFF' position, the flow of electricity is stopped and the device does not emit light.
Eveready advantage: Our long lasting products feature a switch lifecycle of up to 100,000 clicks.
Reflector: An object made by metal or plastic, coated with a shiny aluminium layer that rests around the lamp (light bulb) and redirects the light rays from the lamp to allow a steady light beam, which is the light you see emitting from the flashlight.
Eveready advantage: Our specially designed reflectors provide the optimum light output and feature a high quality of metalizing in which 99.9% aluminium is used.
LED: The LED is the light source within a flashlight. An LED contains a very small semiconductor (diode) that is encapsulated in epoxy and this part emits light when electricity flows through it.
Eveready advantage: Eveready's flashlights feature the bright LED, more than 100 lumens/W and less than 5-10% light depreciation in 3-6 yrs. life of the torch. The long life LEDs work to optimise light & battery life. It produces a high beam length which increases the lifecycle of the flashlights.
Batteries: To ensure the best performance of Eveready flashlights, we recommend the use of our batteries. These batteries have a long shelf-life which allows them to retain a charge for lengthy durations, thus making them ideal for use in flashlights.
By body: Flashlights can be categorised in terms of their body material.
ABS: Acrylonitrile butadiene styrene (ABS) is a common thermoplastic polymer. Its glass transition temperature is approximately 105 °C (221 °F).
Characteristics of ABS:
BRASS: Long lasting and one of the best metal bodies for a flashlight. Brass has been used as a metal for flashlight bodies for many years and is extremely popular with flashlight manufacturers.
By battery: Flashlights can be classified based on the type of battery used to power them. AA, AAA and D sized batteries are all used to power flashlights that vary in size. From flashlights that are as light and small as a pen to the larger flashlights which are used as search lights, the size of the flashlights accommodates different batteries for a range of uses.
The introduction of rechargeable technology has seen the invention of flashlights which run for hours on end with one charge lifecycle.
By light source: Watt is a measure of the power consumed by an electric device and flashlights can be categorised based on their power consumption. Generally, the greater the watt of a flashlight, the greater the beam of light produced by the device. Flashlights range from .1 W to 3 W in terms of power.
The LED is the light source within a flashlight. An LED contains a very small semiconductor (diode) that is encapsulated in epoxy and this part emits light when electricity flows through it.
General advantages: Most energy efficient light source; long lifetime of min. 50000 hrs, environment friendly as it contains no mercury or other hazardous substances.
Eveready advantage: Brightest LED, more than 100 lumens/watt and less than 5-10% light depreciation in 3-6 yrs. life of torch, long life led with optimized light and battery life, high beam length.
The total amount of visible light emitted by a source is known as Lumen. Each type of LED flashlight offers a specific light output, measured in lumens. The consumer must consider how and where they intend use their LED flashlights before choosing the lumen levels they need. Fortunately, Eveready provides plenty of options.
An amount of electrical power expressed in watts. For flashlight, the operating power of a lamp expressed in watts.
The portable nature of a flashlight ensures multiple uses for the device. The most common uses of flashlights are:
The usage of flashlights doesn't end here, it is used in various other ways to provide lighting in hard to access regions.
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