The last picture shows a Lux number of 833 but with a multiplier of x10. In that can you first need to multiply your measured Lux number by the multiplier. It's possible that your calculation will be off. Instead of doing the math yourself, you can use this online calculator as well. (The Lux measurement at 1 meter equals the candela rating) In our case, this would be 1500 lUX x 20 METERS x 20 METERS = 600,000 lux. There is a simple formula for this = LUX x DISTANCE x DISTANCE The first thing you need to calculate is the lux numbers at 1 meter. Example: you measured the lux of your LEP flashlight at 20 meters to be 1500 Lux
So not really a big deal.Ī candela rating is nothing more than the number of Lux at 1 meter. Most LEP flashlights only have 1 or 2 modes. Tip 4: I recommend also measuring the other modes you want to check.
CANDELA LUMEN CALCULATOR PLUS
There is almost no spill that helps to navigate in the darkness, plus the beam is likely to mess your vision in the darkness. Trust me, LEP flashlights have a very tight beam, and while the beam is extremely bright and intense, you will have trouble seeing anything in the dark after looking at the beam during the measurements. Tip 3: Use a headlamp so you have less chance to trip over something and always have enough light to write down the lux numbers.Sound silly? Trust me, if you drop that paper you wish you listened to me. Tip 2: Don't use a piece of paper, but use your hand to write the numbers down.When you reach 30 seconds, write down the highest lux number you found. Continue counting while finding the brightest spot in the beam. Tip 1: when you turn on your flashlight, start counting to 30, when you slowly walk to the wall (or object).I sometimes put it on the ground on a piece of old carpet or on a piece of wood.Ĥ: Walk to the wall and find the highest lux reading by moving the sensor through the beam slowly. Tip: Use a tripod or put the flashlight on something stable like a chair.Tip: When your sensor of the lux meter is 2 cm thick, you can add that to the distance if you'd like to be more precise.ģ: Make sure the flashlight stays at that exact distance.Tip1: (It doesn't need to be precisely 20, 25 or 50 meters since you need to calculate it back to 1meter anyway.Tip: Make sure it's flat since that helps to move the sensor through the beam without changing the distance from the flashlight too much.Ģ: Use the laser distance measure to get a distance of 20 meters or more.It happened to me more than once.ġ: Choose an object like a wall to focus the beam on. Don't assume it's fully charged, check it. The last tip may sound retarded, but always make sure the battery/batteries are fully charged. Most normal tape measures in the US measure in inches and feet, not in meters. The second reason is the ability to measure in Ft as well as in Meters. Buy yourself a laser distance measure (even a cheap one) and thank me afterward. The third thing I would recommend is using a laser distance measure and not a tape measure. The key is to be consistent with all your measurements. You can even mark down a certain distance with a pen/marker for your next round of measurements. The second thing I would recommend is selecting a spot you can use repeatedly. Measurements at that close distance are extremely unreliable due to the beam divergence. Although we want to know the candela at 1 meter, you should never measure at 1 meter. Generally speaking, the best distance for long-range flashlights, including LEP Flashlights, is 20 meters or more. The higher the intensity of your flashlight, the farther away the lux meter should be away from the flashlight. In order to know your candelas, you need 2 numbers: Lux and Distance. With your measurements, you try to use those standards to know what your flashlights are capable of. These are known as the ANSI-NEMA FL-1 standards.
CANDELA LUMEN CALCULATOR HOW TO
The goal of this page is to help you understand how to measure your flashlights for maximum beam distance and beam intensity.įortunately, there are standards that flashlight manufacturers can use for their specifications with regard to Lumens and Candela. Hints and tips before you do your first measurements.
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