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Luxmeter

Lux measuring instruments, also known as illuminance meters, are available in a large number of versions and with various measuring functions.

The palette ranges from pure lux meters to true al-rounders.

But what does a lux meter do?

This device is used to measure illuminance. This physical unit indicates how bright it is at the measuring point, i. e. how much luminous flux of a light source falls on a surface. The further away the defined area is from the light source, the weaker the illuminance becomes.

Illuminance is the incedent luminous flux per illuminated surface and is expressed in lux (lat. light) or footcandles. Footcandle is the Anglo-Saxin measure of illuminance, abbreviated fc. One footcandle corresponds to 10,76 lux, one lux corresponds to 0,0929fc.

A silicon photodiode is often used as a measuring cell in the classic luxmeter. In some devices, the measuring cell also serves as a power supply, so that these devices function without an additional energy source.

The use of the lux measuring device is increasing in all areas of daily life. The measurement of light intensity is of great importance in commercial and industrial areas (topic: lighting at the workplace). Products in stores must be illuminated with the required lux number in order to create the best visual impression for the customer. The lux measuring instrument/lux meter is also used for this purpose.

Lux measuring instruments , also known as illuminance meters , are available in a large number of versions and with various measuring functions. The palette ranges from pure lux meters to... read more »
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Lux measuring instruments, also known as illuminance meters, are available in a large number of versions and with various measuring functions.

The palette ranges from pure lux meters to true al-rounders.

But what does a lux meter do?

This device is used to measure illuminance. This physical unit indicates how bright it is at the measuring point, i. e. how much luminous flux of a light source falls on a surface. The further away the defined area is from the light source, the weaker the illuminance becomes.

Illuminance is the incedent luminous flux per illuminated surface and is expressed in lux (lat. light) or footcandles. Footcandle is the Anglo-Saxin measure of illuminance, abbreviated fc. One footcandle corresponds to 10,76 lux, one lux corresponds to 0,0929fc.

A silicon photodiode is often used as a measuring cell in the classic luxmeter. In some devices, the measuring cell also serves as a power supply, so that these devices function without an additional energy source.

The use of the lux measuring device is increasing in all areas of daily life. The measurement of light intensity is of great importance in commercial and industrial areas (topic: lighting at the workplace). Products in stores must be illuminated with the required lux number in order to create the best visual impression for the customer. The lux measuring instrument/lux meter is also used for this purpose.

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Wettermessgerät und Luxmeter
Luxmeter PCE-EM 888
The climate measuring device PCE-EM 888 is a compact all-rounder and includes 6 different measuring parameters: lux measurement, wind speed, volumetric flow, air humidity, air temperature, temperature with K-type.
173.88€ *
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Lux meter PCE-CRM 40
Lux meter PCE-CRM 40
With the PCE-CRM 40 lux measuring device, important photometric parameters in the field of light measurement can be determined. These include the tristimulus values XYZ, the u´v´ color coordinates according to CIE1976 and...
1,619.24€ *
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Datenlogger PCE-VDL 16I Draufsicht
Data logger for lux measurement PCE-VDL-16I
Universal data logger for illuminance, temperature, humidity, air pressure and 3-axis acceleration. Suitable for luminaire development
440.68€ *
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PCE-LED-20 Anwendung
Lux meter PCE-LED 20
LED Lux meter with 3% accuracy with LED white light. 2.5 measurements per sec. Automatic range selection. Favorite among LED users.
156.48€ *
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Schutzkappe Helligkeitsmesser
Illuminometer PCE-170 A
Lighting meter PCE-170 A is characterized by excellent value for money. Optionally with calibration certificate
From 86.88€ *
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Luxmeter PCE-172
Luxmeter PCE-172
From 134.44€ *
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PCE 174 Anschluß Sensor
Luxmeter PCE-174
From 168.08€ *
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PCE-EM 886 als DVM
Environmental Meter PCE-EM 886
From 26.56€ *
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How many Lux are appropriate?


For the lighting of indoor and outdoor workplaces there are guideline values derived from European standards.

"Illumination of indoor workplaces", EN 12464-1 (June 2011)
"Illumination of outdoor worklplaces", EN 12464-2 (October 2007)

Examples of indoor guidelines:

  • Break rooms: 100 Lux
  • Bakeries: 300-500 Lux
  • Study (office): 500 Lux, at least at the desk
  • Sales areas: 300 Lux
  • Classrooms, seminar rooms: 300 Lux
  • Lecture halls: 500 Lux
  • Corridors: 100 Lux
  • Examination rooms (general lighting): 500 Lux


Examples for outdoor guidelines:

  • Walkways, exclusively for pedestrians: 5 Lux
  • Parking spaces (low, medium, high traffic): 5, 20, 20 Lux
  • Covered platforms, long-distance traffic: 100 Lux
  • Construction sites (construction areas): 50 Lux

 

Luxmeter - more than just an illuminance meter

There are lux meters that are designed solely for measuring luminous intensity. However, there are also devices that are true all-round talents and equipped with extensive measurement parameters.
These include temperature, air pressure, sound, and humidity.
To make your decision a little easier, there is an overview of the respective functions of the all-round lux meter or the pure lux meter.


Overview Luxmeter Allrounder:

 

PCE-VDL 16 I

PCE-EM 882

PCE-EM 886

PCE-EM 888

Temperature

yes yes

yes

yes

Temperature with K-Type

 

 

yes

yes

Air pressure

yes

 

 

yes

Lux measurements

yes

yes

yes

yes

Wind speed

 

 

 

yes

Volume flow

 

 

 

yes

Humidity

yes

yes

yes

yes

Sound level

 

yes

yes

 

Data logger

yes

 

 

 

3-axis accelerator

yes

 

 

 

Accessories

 

Puncture sensor

Infrared temperature adapter

 

Multimeter

 

 

yes

 

Measuring range

 

 

DC voltage

AC voltage

DC current

AC current

Resistor

Capacity

Frequency



Overvie of pure lux meters:

 

PCE-170 A

PCE-LED 20

PCE-172

PCE-174

Calibration certificate

ICA

 

ICA

ICA

Measuring ranges

0,00-40.000 lux

40 / 400 / 4000 / 40.000 / 400.000 lux

40 / 400 / 4000 / 40.000 / 400.000 lux

400 / 4000 / 40.000 / 400.000 lux

Resolution

0,01 lux

 

0,01 / 0,1 / 1 / 10 / 100 lux

0,1 / 1 / 10 / 100 lux

Display

5-digit

LCD-Display

max. display 3999

Display of 40,000 / 400,000 lux
and 40,000 fc in klux or kfc

3 3/4-digit LCD-Display

3 3/4-digit LCD-Display

Accuracy

±10 % vom Messwert +5 Digits

(Entspricht Klasse B / DIN 5032 Teil 7)

± 3% (with a standard incandescent bulb
at 2856 K and LED white light)
± 6% for others
visible light sources

± 5% of reading ± 10 digits (<10,000 lux)

± 10% of reading ± 10 digits (> 10,000 lux)

±5 % of reading ±10 digits (<10.000 Lux)

±10 % of reading ±10 digits (>10.000 Lux)

Measuring rate

2 per second

2,5 per second

1,5 per second

1,5 per second

Operating condidtions

0...40 °C 

+5 ... +40 °C/ 0...70 % rF

0...40 °C / 80 % r.F.

0...40 °C / 80 % r.F.

Memory

 

99 readings

 

16.000 readings

Overload display

OL= Overload

OL= Overload

OL= Overload

OL= Overload

Reproducibility

 

± 3 %

± 3 %

± 3 %

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