It might sound impressive for a light to boast 3000 lumens, but if it can only do that for 15 minutes and it doesn’t have a good selection of lower power modes, that’s going to be a special use case light that isn’t useful for much else. In other words, how efficiently does this light convert battery energy into a useful light beam? When it comes to buying a flashlight and comparing various models, it’s more useful to compare the candela ratings against the various battery life ratings. In a pinch, if a manufacturer only shares one figure and you’re curious about the other, you can use this conversion to get an idea. That varies of course by the efficiency of the flashlight and its reflector. Roughly speaking, 1 candela is equal to 12.57 lumens. In my opinion, it makes for the better pocket light overall of the two. The D2, comparatively, struck a better balance of still having a solid throw distance but also illuminating a useful area in front of me. It did a poor job of lighting up any area around me, and I’m not often enough in a scenario where I need to see a mile away and nothing else. Even though the Sofirn had a superior throw distance and max lumen rating, its beam was so focused on throw distance that’s all it was good for. In my comparison review of the Sofirn IF22A and Lumintop D2 as an example, I found the D2 to be more useful overall. The pen light will have lower lumens and higher candela because its job is to illuminate a smaller overall area, but concentrate that light into right in front of the user. The lighbulb will have high lumens and low candela because its purpose is to create a lot of light and throw it in all directions to illuminate a whole room evenly. The gist of it is to consider the purpose of the light, such as a lightbulb in your home versus a small pen light. Most flashlight enthusiasts agree that overall lumens matter less than how they are used. In this example, one might find the 300 lumen flashlight more useful than one with over 3x the lumens.
Its beam may also be uneven or have artifacts in it from a poor reflector. It might have plenty of spill and illuminate the whole area, from a width standpoint, but not shine far enough to be helpful. On the other hand, a competing flashlight might have 1000 lumens but only produce useful light over a fairly short distance. One might find that incredibly useful for general purposes. An Example of Lumens vs Candela Considerationsįor instance, a flashlight with 300 lumens and a great reflector might product a nice even beam with a good throw distance and still have decent spill light (the light to the sides of the main beam). To put it a different way, it’s possible for a flashlight with a lot of lumens to project a not-so-useful beam in practical usage, and if you’d purchased it just because of that number you might be disappointed. Since this measurement is taking a linear direction into account, it says more about the flashlight’s ability to project a useful beam over a distance. When we’re talking about flashlights, many people consider candela to be more useful. (Similar to how car engines are measured in horsepower from back when horses were the primary vehicles.) It’s a measure of roughly how many candles the light’s output is equivalent to. Candela (or candlepower) gets its name from back when people primarily used candles as lights.
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