Sauermann LX 200 - Hand-Held Luxmeter

Handheld Luxmeter

• Measuring range: from 0.1 to 200,000 lux
• Relative illuminance
• Instantaneous illuminance

The Sauermann LX 200 Luxmeter is a photometer for measuring illuminance, it is equipped with a photoelectric detector and with a silicon photodiode coupled with a filter to modify its response and to get it as close as possible of the reference function V(λ)defined in the CIE (International Commission on Illumination).  LX 200  is a hand-held autonomous instrument fully automatic designed for measuring illuminance. With its memory, it allows the storage of datasets for processing on a computer.

Results are displayed in Lux or in footcandle and allows 5 measurement modes:

Instantaneous illuminance:
Displaying of instantaneous values, maximum and minimum values.

Relative illuminance:
Allows a relative measurement to a reference point to quantify a light input or an illuminance decrease.

Uniformity: 
Calculation of the min / ave ratio for determination of illuminance uniformity at workstation according to NF EN 12464-standards - 1 - Lighting of workplaces (inside).

Evolution of illuminance according to weather conditions:
Storage of temporal evolution of illuminance for the follow up of environment conditions.

Mapping of illuminance - Spatial representation:
Realization and  storage  of  cartography of light  environments.  Colored  representation according  to levels obtained for printing of report (on a computer such as PC).

These different measurement modes are compatible with the following standards :  

• NF EN 12464-1 – Lighting of workplaces (inside) 
• NF EN 12464-2 – Lighting of workplaces (outside) 
• NF EN 12193 – Lighting of sports facilities

Its sensor is composed of a silicon photodiode in which spectral response corresponds to the photopic curve according to CIE standard. Small, with its LCD graphic display of 64*128 pixels resolution, using a high-tech electronics,  LX 200 is a powerful instrument and easy to use.

Photometric data

Photometric data are data that allow us to define the action of electromagnetic radiation on the visual function of the eye of an observer. The average standard eye, adopted by the CIE (International Commission on Illumination), is defined by a function on spectral efficiency which is relative to spectral for daytime vision or photopic.

Luminous flux

The luminous flux of a source is the assessment, according to the sensitivity of the eye, of the amount of light radiated throughout the area by this source. It is expressed in lumens (lm).

Luminous intensity

The light intensity is the luminous flux emitted per unit of solid angle in a given direction. It is measured in candela, equivalent to 1 lm / sr.

Luminance

The luminance of a source is the ratio between luminous intensity emitted in one direction and the apparent surface of the luminous source in the considered direction. Luminance is expressed in candelas per square meter (cd/m2).

Illuminance

Illuminance of a surface is  the ratio of the luminous flux received at the area of the surface. Its unit is the lux, equivalent to 1 lm/m2. It is also expressed in footcandle (fc) according the ratio :  1 fc = 10.76 lux.