So let us look at some of the most common terms related to flashlight technology and attempt to simplify their meaning.
One of the most confusing aspects of flashlight terminology is how their brightness or output is measured. Traditionally, most flashlight manufacturers have used the measurement known as candlepower. The problem with that, however, is that candlepower is not a direct measurement of the output of the flashlight. Instead, it is a measurement of the space in which the beam of a flashlight can be identified.
More recently, some manufacturers have begun using the measurement known as lumens. Lumens is generally more appropriate because it measures the actual intensity of the flashlight. Therefore, the use of lumens allows consumers to more accurately compare the output of flashlights in an "apples to apples" comparison versus "apples to oranges."
It is important to note that some manufacturers advertise the theoretical or mathematic output of their flashlights versus the actual measured output. So just because a flashlight is advertised as having an output of X lumens does not mean that it will actually be that bright when you go to use it. Fortunately, the more reputable flashlight manufacturers measure the actual output of their flashlights and publish that lumen amount.
So, what is a good lumen amount to have? It depends! Keep in mind that the more lumens a flashlight has, generally, the sooner it will expire the battery. If you are looking for a general purpose flashlight then 15 - 30 lumens may be enough. On the other hand, if you are looking to shine the light across far distances at night then you would probably want more than 100 lumens.
Another term used commonly when referring to flashlights is cells. What does it mean when a flashlight has two cells? The number of cells that a flashlight has refers to the number of batteries that powers it. For example, a flashlight with two cells uses two batteries. The ideal number of cells will depend on how large of a flashlight you desire and what you intend to do with it.
Many common flashlights are powder coated. That is what gives them their color. Powder coating is typically cheaper than other forms of finishing. Powder coating is a spray-on finish that is fairly durable and available in a wide variety of colors.
Higher-end flashlights will be hard coat anodized. What does that mean? Flashlights are usually made from aluminum because it is lightweight and inexpensive. Aluminum can not be blued as steel is in firearms. It can also corrode if left exposed. Therefore, some manufacturers prefer to hard coat anodize the aluminum which gives it a very hard, durable finish. The anodizing is actually part of the metal, not coated on top of it. Think of it as a very thin, tough skin. The downside to anodizing, other than cost, is that it is only available in a few colors, such as gray, black, green, gold, and red.
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