One lux is considered as bright as the illumination of a surface from a candle 1 meter away. Lux is the standard unit of measurement for brightness, or light intensity.
One lux is also the equivalent to 1 lumen spread over approximately 1 meter. A lumen is the measurement of the total amount of light that a source emits, such as a light bulb. A lux measures how many lumens are needed in a given area that needs illumination. The larger the surface area that needs to light in lux measurement, the larger the amount of lumens that are required for that same surface area.