And for comparison: 100 cd equals 1 lx (on a vertical screen at 10m distance). 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.
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