The table below arranges lights from low candela (left) to high. Now, let’s look at some real-world examples. 500 lumens of the M340C when using CR123 batteries. The smaller LED of the Turbo is also reflected by the 350 vs. Even then, accompanying photos show the spot patterned SureFire M340DFT Turbo has a wider diameter and longer lens than its SureFire M340C cousin. To achieve a reasonable size, manufacturers sacrifice lumen with smaller emitters. Just like how a V12 engine requires a large chassis, a large and high-output emitter requires a large lens to produce a spot beam. ![]() It’s trivial to say higher lumen is better, but reality is more nuanced due to size constraints. Whether we are looking into a shadow caused by a streetlamp or defeating window tint, higher candela is better. However, we can still make an objective comparison in its ability to penetrate photonic barriers. While it’s a stretch to call it misleading, this forces us to infer a beam pattern. Unfortunately, marketing material usually oversimplifies that into a single number representing the peak hotspot. At a scientific level, candela varies from dead-ahead to the edge of the spill that shape shows how tight the hotspot is. With lumen as the undirected output of the LED emitter, candela is the light projected in a specific direction. The job determines which measurement is more important. Neither is inherently good or bad a light bulb cannot designate targets while a laser pointer cannot illuminate a room. A bare lightbulb has low candela but high lumen because it evenly projects light everywhere. ![]() A laser has high candela but low lumen because it is extremely bright at a very narrow angle. In very broad strokes, lumens are the raw material which the lens shapes into candela. The SureFire M340DF (right) has a wider and longer head than the SureFire M340 (left).
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