2/28/2024 0 Comments Lux vs candela vs lumens![]() In case of two lamps with the same lumen value and different beam angles, the luminous flux is distributed over a different solid angle. The luminous intensity results from the luminous flux related to the solid angle. But a comparison of these values seems to be difficult, because the luminous intensity additionally is direction-dependent. ![]() Candela Lumen Comparisonīoth values are transmission units. Especially for highly directional LED bulbs such as spots or LED recessed spotlights, the luminous intensity is sometimes indicated on the packaging or in the data sheet in addition to the luminous flux. This is the luminous flux emitted in a specific direction in lumens. And for comparison: 100 cd equals 1 lx (on a vertical screen at 10m distance).The luminous intensity of a light source is specified in candela. ![]() A common candle emits light with roughly 1 cd luminous intensity. Candela measures light intensity in a given direction and is used for rear light specifications. Therefore, it’s good to also check the actual light patterns when comparing bike lights. You can also say that Lux is a measure of how well the optics in the bike light uses the available light (lumens).īut to be clear, in real life your bike light will not hit the road straight ahead as in the tests, but diagonally, so the light will be distributed on a bigger area. This is often a more accurate way of describing and comparing how well the light illuminates a given area. In the bike business, the Lux value is usually measured on a vertical screen at 10m distance (as per the German type approval measurement). Lux is a measure of how much luminous flux is spread over a given area. Lumen is a frequently used value for comparing lights, but it’s important to remember that the real perceived intensity of the light will depend on the direction and the area onto which it is projected. More lumens equal more light, but there’s more to it than that. ![]() This is a measure of the total “amount” of visible light emitted by a light source. Lux values tell you how bright a given surface will be.Īnd the slightly longer version: Lumen (lm).Candela indicates the visible intensity in a given direction, from the light source.Lumen is a measure of how much light is emitted.Read more in “ What defines a good light pattern?” Pro tip 2: A strong light is great but not all that matters it’s just as important how the available light is spread in the light pattern. Pro tip 1: Always check that the indicated lumen/lux values are the stable values. Herrmans always mentions the stable value, measured after 30 minutes, not only the initial higher value that typically only lasts a few minutes. Depending on the construction and cooling of the light, the output will decrease gradually until a stable level is reached. Interpreting light valuesĪll LED bike lights, regardless of brand, will be brightest when just turned on, and shine less bright when they get hot. We have put together a guide for you with the basics you need to know. You want to compare different lights objectively to find the optimal light for your way of riding and that will give you the best value for your money. Sounds simple enough, but there are a few things that are good to know. When you consider buying a new bike light, the first thing that comes to mind is probably how bright the light should be. Bike light buying guide: comparing light values Know your way around lumen, lux and candela – the basics of light and optics
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