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Light Meter *
For Homes, Schools, and the Workplace
Features
Applications
- Light measurement in:
- Repro table output
- Artwork display lighting measurement
545 Light Meter
The quality of light in the workplace, schools, and public buildings
affects the quantity and quality of performance in workers and students.
Luminous intensity must fulfill specific minimum guidelines in order
to be considered good quality light. The 545 Light Meter and Datalogger
is ideal for fast, easy, and non-disruptive measurement and documentation
of light quality in the workplace, hospitals, offices, schools, and
homes. The 545 Light Meter uses special optic filters to reconstruct
the exact response of the human eye to light intensity. A light measuring
cell in the meter (photo diode) converts incident light into an electronic
signal that is read and displayed on the meter’s LCD.
The Effects of Light Quality
Approximately 80% of sensations are experienced through the eye.
For this, the human eye requires light. According to an American
study, 25% of human energy is needed for the process of sight. Humans
are accustomed to the light intensity available during the day (approximately
500 fc on a dreary day and up to 10,000 fc on a sunny day). Compare
this to the light intensity of artificial light (between 1 and 10
fc) and you can see where the problem lies. Fatigue caused by too
little light is generally experienced as systemic tiredness rather
than just eye fatigue alone. After spending eight hours a day, five
days a week in the typical work setting, the fatigue of too little
light can cause degradation of performance.
Measurement of Luminous Intensity
Luminous intensity is measured and reported in footcandles (fc)
or in lux if using metric measurement. A light meter is sometimes
referred to as a lux meter. One footcandle is equal to the total
intensity of light that falls on a one square foot surface that is
one foot away from the point source of the light. When measuring
in lux, meter is substituted for foot.
Examples of Luminous Intensities to DIN 5035, Part 2
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Location
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Footcandles (fc)
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| Offices |
| Office rooms |
30 |
Typing, drafting areas
|
75
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| Factories |
Visual work on production lines
|
100
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| Hotels |
| Public areas |
20 |
Reception, cashier points
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20
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| Stores |
Show windows
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150 - 250
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| Hospitals |
| Wards |
10 - 15 |
Emergency treatment areas
|
50
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| Schools |
| Auditoriums, indoor gyms |
30 |
| Classrooms |
40 - 70 |
Performance Profile
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| Sensor: |
Silicon photo diode
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| Measuring Range: |
0 to 10,000 fc
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| Accuracy: |
to DIN 5032, Part 6
f1 = 8%
f1 = V (1) adaptation
f2 = 5%
f2 = cos like rating
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| Resolution: |
Can be switched
0 to 3,200 fc: 1 fc
0 to 10,000 lux: 10 fc
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| Display: |
2-line LCD and 2 matrix lines
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| Battery Life: |
9 V IEC 6F22 > 50 h Al-Mn
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| Battery Check: |
Automatic, in 4 stages
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| Operating Temperature: |
32 to 122 F
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| Storage Temperature: |
-4 to 160 F
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| Dimensions: |
8.7 x 2.7 x 2 inches (22 x 6.9 x 5 cm)
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| Weight: |
18 oz (510 g) including packaging
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Ordering Information
| Description |
Cat. No. |
| 545 Light Meter/Logger * includes
meter with probe, battery, and calibration protocol |
751-545 |
| 545 Light Meter/Logger * includes meter
with probe, battery, calibration protocol, and NIST calibration
certificate |
751-545C |
| 545 Light Meter/Logger Kit * includes
meter with probe,
battery, TopSafe cover, transport case, and infrared printer |
751-545K |
| 545 Light Meter/Logger Kit * includes
meter with probe, battery, TopSafe cover, transport case,
infrared printer, and NIST calibration certificate |
751-545KC |
| Accessories |
Cat. No. |
| TopSafe Cover for 545 Light Meter/Logger,
protects from impact and dirt, includes bench stand and belt
clip |
751-441 |
| Transport Cover for 545 Light Meter/Logger,
for transport and storage of meter, TopSafe cover, probe, and
printer |
751-325 |
| Infrared Printer for 545 Light
Meter/Logger,
prints date, time, and serial number. Can also be used
with 535
CO2 monitors †. |
751-540 |
| ComSoft 3 Software includes analysis and graphics
functions and trend curve. Generate reports for easy record keeping. |
751-0830 |
| * |
Not suitable for use as a photography
light meter
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| † |
For
more information on CO2 monitors, see the Carbon
Dioxide Monitor page or download the
Carbon Dioxide Monitor Product Data Bulletin (PDF) |
Lighting Guides
Published by the Illuminating Engineering Society of North America
(IESNA), these easy-to-read guides contain the American National
Standard Practice for Office Lighting (ANSI/IESNA RP-1-1993) and
Lighting Industrial Facilities (ANSI RP-7-01). Photographs, charts,
and illustrations promote reader understanding of topics such as
luminous environment considerations, visual task considerations,
psychological effects of lighting, economics and energy, offices
with visual display terminals, and safety.
| Description |
Cat. No. |
| Office Lighting |
877-612 |
| Industrial Lighting Facilities |
877-611 |
Download
545 Light Meter Product Data Bulletin (PDF)
This page was last modified May 7, 2007
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