Post last updated on July 15. 2021 by Wayne Wilson. Check also out the homepage for the latest posts

Common questions with answers

Here are the most frequently asked questions when it comes to flashlights and other light sources, batteries, equipment, and confusing terminology that don’t make sense for most people, everything explained as easily as possible. In this Q & A we take a look at what lumen, Cree, LED, 18650, mAh, Volt, WH, and so on means. If you still can’t find the answer to what you are looking for, feel free to use the contact page to send an email to LumenFreaks. You can also search for your question on Google or Wikipedia and see what shows up

Frequently Asked Questions

  • What are lumens?

    Lumens is a measurement of the total amount of visible light emitted from a light source, like flashlights, lightbulbs, lamps, etc. The higher the lumen number, the brighter the light is. 1 candlelight is equal to 12.57 lumens

  • How bright is 1000 lumens?

    1000 lumens equal to around 80 candlelights, as 1 candlelight has a lumen output of 12.57 lumens. For comparison, a 60W incandescent light bulb outputs around 900 lumens

  • What is the brightest flashlight?

    The brightest flashlight on the market now is the Imalent MS18 which has a lumen output of 100.000. It runs on 8 x 21700 4000 mAh batteries and uses 18 Cree XHP70 2nd high lumens LED bulbs to emit the light. The price for this flashlight is $669.95

  • What flashlights do police use?

    There is no particular brand that all the police use, contrary to the belief, they use a variety of flashlights depending on their needs. Commonly used for everyday carry is tactical flashlights thou, as they are both small, bright, and easy to charge

  • What does 18650 mean?

    18650 is the physical size of the battery. In this case, 18650 means its 18 mm in diameter and 65 mm in length. A 21700 battery is 21 mm x 70 mm. The zero at the end means that the battery shape is cylindrical

  • What does LED mean?

    LED is an acronym and stands for Light Emitting Diode. The semiconductor diode emits light when conducting current and is around 85-90% more cost-effective than incandescent bulbs. They produce more light, doesn't heat up, and uses less electricity

  • What does Cree mean in flashlights?

    Cree is simply the manufacturer of the LED bulbs the flashlight uses. Cree is based in North Carolina and produces high output LEDs that are widely used in bright flashlights. If the flashlight uses Cree bulbs, it's a good sign that tells the product is the real deal, and not some cheap knockoff

  • Can I recharge Alkaline batteries?

    No. You should not attempt to recharge disposable Alkaline batteries. Attempting to do so may cause hydrogen gas generation inside the batteries. Since Alkaline batteries typically are sealed, they may rupture and leak their contents out, and even explode

  • What is IMR, INR, ICR?

    IMR, INR, ICR, and so on are product codes that tell what the main components of the batteries are. The first letter is the positively charged electrode by which the electrons leave an electrical device. The second letter is the negatively charged electrode by which electrons enter an electrical device, and the letter R means it's rechargeable. IMR = lithium-Ion Manganese Rechargeable. INR = lithium-Ion Nickel Rechargeable. ICR = lithium-Ion Cobalt Rechargeable

  • What is volt?

    Volt is the measurement of electromotive force. Simply explained it can be referenced to water flowing through a pipe to a generator. Low voltage means little water and produced electricity, while higher voltage is more water, giving a larger pressure and electricity production

  • What is mAh?

    mAh is short for MilliAmp Hour and is a measurement of electric power over time. The more mAh the battery has, the longer it can run. A battery with a high mAh will power the flashlight longer than a battery with a lower mAh. Think of mAh as the size of a car’s fuel tank. The bigger it is, the longer the car can run

  • What is Watt?

    A watt is a unit of measurement of power. One watt is the rate at which work is done when one ampere of current flows through an electrical potential difference of one volt. Simplified you can think of watt as the speed a car is driving, only the car is electrons

  • What does watt-hour mean?

    Watt-hour, or WH, is the amount of energy an item consumes over a given timeframe, usually measured in kilowatt-hours. For example, a 60W lightbulb running for an hour will use 60 watt-hours, divided on 1000 and you get the kWh, which in this case is .06