A single lux is equal to one lumen per square meter. Lux (lx) measures illuminance, which is the amount of light on a surface per unit area. The Las Vegas hotel right? Wrong, that’s the Luxor. Again, candela is the luminous intensity which describes how bright a light source is. This is because the same intensity of light can be seen from any non-obscured direction at the same distance. If you have a light bulb generating 1 cd and block part of the light, every direction not obscured still produces 1 cd. A simple comparison is that 1 candela is roughly equivalent to the light from a single candle. Laser pointers or spot lights have the highest candela rating since the majority of their light is focused in a single direction. This is different from lumens (a total light output) because it’s the value of light intensity from any point in a single direction from the light source. Any light source eventually becomes too dim to see the further away you are. It tells you how bright the light source is which shows how far away from an object you can be and while still being able to see it. Candela is the base measurement for describing luminous intensity. We’ll start with candela (cd) – also commonly called candlepower. Let’s break it down into the long answer to dispel a few more shadows. The short answer is that they’re all separate standards for measuring different kinds of lighting effects. Inside, you question why no one uses the same system for measuring these things, and take your best guess based on the other items on the shelf. You walk into a store, pick up light bulb or a handheld spotlight and look at the specifications- only to find that one says lumens, another says lux, and the last reads something about candela.
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