The term Lux (lx) is the typical measurement used in various Australian Standards and Building Codes to determine the minimum light levels for various areas so is probably the most familiar and most useful measurement to consider when purchasing a LED light bulb.

Lux is the SI unit of luminance or illumination of a one metre square area, which is equal to one lumen per square meter. Some examples of typical light (lux) levels are given below:

Rather than measuring the total quantity of light produced by the light source, a lux meter will measure the quantity of light distributed over or at a particular area at a specified distance from the light source. For example, if one is attempting to obtain a suitable light level for an office then the ideal position is to measure the light at the height of the work plane or office desk. In contrast, if one is attempting to obtain a suitable light level for an internal corridor then the light would be measured at the level of the floor. If there is no specified plane then the measurement is typically taken at a horizontal plane at 0.75 to 0.8m above the floor.

Many LED bulb manufacturers will provide Lux distribution diagrams which provide a measurement of Lux level at various distances and diameters from the light source. This information can be useful for determining what beam angle you require for your LED light globe such that narrower angles will have a smaller lux/light distribution but higher centre beam lux level at various distances. The converse can be said for LED light globes with wider angles. 60 to 72 degree beam angles are most common in Australia. Narrower beam angles are usually considered for spot lighting in art or retail applications.

Below is a list of typical Lux levels required for different environments.