Lux Meter

The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area.It is equal to one lumen per square meter. In photometer, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watt per square meter, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, “lux” is used as both the singular and plural form.

Adequate Light Levels LUX at your working & working areas:-

The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area.[1][2] It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watt per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, “lux” is used as both the singular and plural form.

Iluminance (lux): the iluminance refers to the incidence of the light flux on a surface, per unit of surface
The unit of illumination is the lumen per square metre: lux (lux). A single lux is equal to one lumen per square meter.

Luminous flux (Lm): Total amount of light emitted in all directions by the light source. The lumen (unit lm) gives the total luminous flux of a light source by multiplying the intensity (in candela) by the angular span over which the light is emitted. .

Here are some examples:

Candle 12 lm
Incandescent lamp 60 W 750 lm
LED 1 W 130 lm 130 lm

For example, a 1 candela light source will produce 1 lumen per square meter at a distance of 1 meter.
A lux is equal to one lumen per square meter (lux = lumens/m2).

Luminous intensity / Candela: Candela is the base measurement for describing luminous intensity.  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.  The unit is the steradian lumen, better known as candela (cd).

The luminous intensity of a candle is 1 candela

Essentially, as the light moves from the transmitter, it disperses into an area. The further away the light has to travel, the more it will be scattered. Therefore, the amount of lux in an area or on a surface can vary depending on the distance travelled by the light and the angle with which it is dispersed.
When the lumens supplied by a given transmitter are the same, light that travels less distance and/or is more narrowly focused will appear brighter because the luxes are concentrated in a smaller area than light that has travelled a greater distance and has been scattered over a larger area.

Beam angle: The beam angle is the radiation angle of a light source. For example, a beam angle of 30 degrees means that the light is shaped like a cone and its edges form a 15 degree angle with the central axis. A change in the radiation angle affects the light intensity (lux) of a light source but not the light flux (Lumens).

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