The last tip may sound retarded, but always make sure the battery/batteries are fully charged. Don’t assume it’s fully charged, check it. It happened to me more than once.

The second thing I would recommend is selecting a spot you can use repeatedly. You can even mark down a certain distance with a pen/marker for your next round of measurements. The key is to be consistent with all your measurements.

TIP : instead of dividing the Lux number by 0.25, an easier approach is to multiply it by 4. Same conclusion: (600,000 x 4 = 2,400,000)

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Most Lux meters use a multiplier. In that can you first need to multiply your measured Lux number by the multiplier. Take a look at the following images. All 3 Lux Meters use multipliers. The last picture shows a Lux number of 833 but with a multiplier of x10. In that case, the lux number is actually 8330, and you have to do the calculation with 8330 instead of 833. Please note, this was just a quick example and not from a real LEP measurement at 20 meters.

The goal of this page is to help you understand how to measure your flashlights for maximum beam distance and beam intensity.

In order to know your candelas, you need 2 numbers: Lux and Distance. The higher the intensity of your flashlight, the farther away the lux meter should be away from the flashlight. Generally speaking, the best distance for long-range flashlights, including LEP Flashlights, is 20 meters or more. Although we want to know the candela at 1 meter, you should never measure at 1 meter. Measurements at that close distance are extremely unreliable due to the beam divergence.

The third thing I would recommend is using a laser distance measure and not a tape measure. I’ve been there, done that. Too much hassle, especially in the dark. Buy yourself a laser distance measure (even a cheap one) and thank me afterward. The second reason is the ability to measure in Ft as well as in Meters. Most normal tape measures in the US measure in inches and feet, not in meters.

While you have your measurements in Candela, you can use the following formula to calculate your beam distance in meters.

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Fortunately, there are standards that flashlight manufacturers can use for their specifications with regard to Lumens and Candela. These are known as the ANSI-NEMA FL-1 standards. With your measurements, you try to use those standards to know what your flashlights are capable of.

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