[ANSI FL-1]  The American National Standards Institute (ANSI) approved a new specification standardizing flashlight performance. The standard was developed by the Flashlight Standards Committee of the National Electrical Manufacturers Association (NEMA). The committee consisted of a number of flashlight manufacturers. The resulting specification is called ANSI/NEMA FL-1. As with many technical specifications, the full standard can only be purchased from ANSI or NEMA.

The purpose of the standard is to allow consumers to make apples-to-apples comparisons of lights and to eliminate exaggerated light performance by quoting “emitter lumens” or “out-the-front lumens”. The tests can be performed by the manufacturer or an independent lab. The necessary equipment and calibration makes this an expensive undertaking.

[Backcountry] a remote undeveloped rural area

[Backpacking] To hike while carrying a backpack or knapsack.

[Beam distance] is defined as the distance from the device at which the light beam is 0.25 lux (0.25 lux is approximately the equivalent of the light emitted from the full moon “on a clear night in an open field”).

[Beamshot] a picture of the beam of a flashlight, usually on a white wall, or outside on plants.

[Camping] a place usually in the country for recreation or instruction often during the summer

[Canyoning] Also known as canyoneering,  is traveling in canyons using a variety of techniques that may include otheroutdoor activities such as walkingscramblingclimbingjumpingabseiling (rapelling), and/or swimming.

[Caving]  Also occasionally known as spelunking in the United States and Canada and potholing in the United Kingdom and Ireland—is the recreational pastime of exploring wild (generally non-commercialcave systems. In contrast, speleology is the scientific study of caves and the cave environment.[1]

[Driver] The driver consists of the electronics that take power from the battery and send power to the LED. They amplify or reduce the voltage from the batteries to the correct level for the LED and also control the amount of current that can be delivered. The driver also contains the electronics that give the flashlight its user interface, including the number of modes and how those work relative to button presses. The driver has a positive and negative input from the battery, and a positive and negative output that goes to the LED

[Duty free shops]  are retail outlets that are exempt from the payment of certain local or national taxes and duties, on the requirement that the goods sold will be sold to travelers who will take them out of the country. Which products can be sold duty-free vary by jurisdiction, as well as how they can be sold, and the process of calculating the duty or refund the duty component.

[EDC] everyday carry. A flashlight someone keeps on their person all the time. Seems to have been borrowed from handgun forums.

[Flashlight] Also called torch,  is a handheld light source powered by batteries.

[Flashlight tag] is a playground game that involves one or more players chasing other players in an attempt to “tag” or touch them, usually with their hand. There are many variations; most forms have no teams, scores, or equipment.Some variants of tag use equipment such as balls, paintball guns, or even flashlights to replace tagging by hand.

Traditional flashlights have an incandescent bulb and are powered by a couple of alkaline batteries. They are On or Off. But in the past ten years or so LED flashlights have made enormous leaps in performance offering more light, longer bulb life, and greater efficiency, meaning you can use smaller batteries or that your batteries will last longer.Incandescent light bulbs have made progress too, with xenon and halogen bulbs available.

[Gadget] A gadget is a small technological object (such as a device or an appliance) that has a particular function, but is often thought of as a novelty. Gadgets are invariably considered to be more unusually or cleverly designed than normal technological objects at the time of their invention. Gadgets are sometimes also referred to as gizmos

[Gear] Personal belongings and accessories, including clothing

[Geocaching] is an outdoor sporting activity in which the participants use aGlobal Positioning System (GPS) receiver or other navigational techniques to hide and seek containers, called “geocaches” or “caches”, anywhere in theworld.

[Headlamp] also called headlight  is a light worn on the forehead

[Hiking] To go on an extended walk for pleasure or exercise

[Impact resistance] is the degree to which a device resists damage from dropping on a solid surface.

[Lantern]  transparent or translucent, usually portable, case for enclosinga light and protecting it from the wind, rain, etc.

[LED] An LED (Light Emitting Diode) is a type of solid-state lighting. In keeping with the properties of a diode, electric current can only flow one direction through an LED. As the electrons cross from a material abundant in negative charge carriers to a material abundant in positive carriers active region, they lose a specific amount of energy, which results in photons of a particular wavelength. Different semiconductors used in the manufacture of LEDs will result in different wavelengths (colors) of light emitted. Currently, the brightest semiconductor materials are Aluminum Indium Gallium Phosphide (AlInGaP) for reds, oranges, ambers and yellows, and Indium Gallium Nitride (InGaN) for blues and greens. A white LED is typically a blue LED coated in a yellow emitting phosphor (this is why flashlight LED’s appear yellow when they are off), or combination of phosphors, which are excited by the blue light and produce light as a result. When this yellow light mixes with the blue light from the LED, the combined light appears white to the human eye.

[Light Output] is the total luminous flux. It is the total quantity of emitted overall light energy as measured by integrating the entire angular output of the portable light source. Light output in this standard is expressed in units of lumens.

[Light painting] also called light writing, light graffiti, light bombing and light art is a photographic technique in which exposures are made by moving a hand-held light source or by moving the camera. The term light painting also encompasses images lit from outside the frame with hand-held light sources.

[Range] 

[Rechargeable flashlight] A rechargeable flashlight is a portable device meant to provide emergency or temporary light in a location for a certain purpose. The energy from the flashlight comes from an onboard battery pack which is capable of being recharged or from an onboard generator powered by motion. A rechargeable flashlight is most useful in situations where continued use of a traditional flashlight would cause a significant expense in batteries.

Most rechargeable flashlights have an onboard battery pack. This battery pack can last anywhere from several hours to dozens of hours, depending on the lamp source and its required output. In most cases, getting a few hours of use out of a battery is all that is required.

In some cases, a rechargeable flashlight may come with a docking station. This makes it convenient to recharge. When not in use, the most logical spot to store the flashlight is in its docking station. That way, when it is needed again, it is ready and fully charged. The docking station usually has an indicator light to show when the rechargeable flashlight has a full charge.

[Run time] is defined as the duration of time from the initial light output value—defined as 30 seconds after the point the device is first turned on—using fresh batteries, until the light output reaches 10% of the initial value.

[RLS] Reflector Lens System, optimizes light output by using a more efficient reflector to gather light (spot-beam) and a more sleek lens design to diffuse light (flood). The RLS system is 10-15% more efficient than existing product that use a single, solid plastic optic (like the LED Lenser TIR).

[Sporting goods]  also called sports equipment, sporting items and accessories sold as a commodity

[Spotlight] A lamp projecting a narrow, intense beam of light directly onto a place or person, esp. a performer on stage.

[Survival kit] Iis a package of basic tools and supplies prepared in advance as an aid to survival in an emergency. Military aircraft,lifeboats, and spacecraft are equipped with survival kits.

[Tactical flashlight]  tactical light is a flashlight used in conjunction with a firearm to aid low light target identification, allowing the marksman to simultaneously aim and illuminate the target. Tactical lights can be handheld or mounted to the weapon with the light beam parallel to the bore. Tactical lights also serve a role as a method of non-lethal force, used to temporarily blind and disorient targets.[1][2] Features particularly associated with tactical lights include shock resistance, reliability, lightweight and powerful batteries, and high light intensity. Tactical lights may have optional filters to produce colored light, or may emit only infrared radiation for use with night vision equipment. A sighting laser may also be added to a weapon-mounted tactical light.

[TIR] total internal reflection. A glass or plastic “lens” that collimates light rays from the light emitter, both by reflecting them and by refracting them. Theoretically, ALL of the light produced by the emitter is gathered by the TIR optic. See RLS

[Unique gifts] special gift ideas for specific occasions or personalized products

[Water proof]—IPX7—Ingress of water in quantities causing harmful effects shall not be possible when the enclosure is temporarily immersed in water under standardized conditions of pressure and time.

[Water resistant]—IPX4—Water splashed against the device from any direction shall have no harmful effects.