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Light Meter

The Amprobe LM-100 light meter measures the visible light from fluorescent, metal halide, high-pressure sodium or incandescent sources.


It is a portable, easy-to-use digital light meter designed for simple one-hand operation reading in Lumen (lux) or footcandle (fc) units. The LM-100 measures a wide range of light up to 20,000 fc or lux with an accurate, high resolution of 0.01 fc/lux. 

Use the LM-100 light meter to measure the illumination level in the interior and to switch off or reduce or increase the output level of lighting fixtures. Reduce the energy burden of the building by significantly increasing the efficiency of its lighting system. 

One lux is the illumination from a one candela lamp perpendicular to a surface one meter squared at a distance of one meter. One fc is the illumination from a one candela lamp perpendicular to a surface one foot squared at a distance of one foot. 1 footcandle = 10.764 lux and 1 lux = 0.09290 footcandles. 

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Illumination    Accuracy at 23°C ± 5°C (73.4°F ± 5°F), < 75% R.H.
Sensor   Silicon photodiode and filter
Measurement Rate   2.5 times per second
Range   20, 200, 2000, 20000, 200000 Lux
20, 200, 2000, 20000 Foot candles
Accuracy   ± 3% (Calibrated to standard incandescent lamp at 2854°K) 
    6% other visible light sources 
  Angle deviation from cosine Characteristics 
  30°  ± 2% 
  60°  ± 6% 
  80° ± 25% 
    Cosine Angular corrected per JIS C 1609:1993 and CNS 5119 general A class 
    Resolution: 0.01 fc/lux
General Specifications
Display   3 ¾ digit liquid crystal display (LCD) with a maximum reading of 1999
Sample Rate   2.5 times per second for digital display
Polatity   Automatic, positive implied, negative polarity indication
Overrange   (OL) or (-OL) is displayed
Zero   Automatic
Low Battery Indication    The  is displayed when the battery voltage drops below the operating level
Temperature / Humidity  Operating -10 °C to 50 °C (32 °F to 122 °F); 0 to 80%RH 
  Storage -10 °C to 50 °C (32 °F to 122 °F); 0 to 70%RH 
Altitude   2000m, indoor operation
Battery   9V NEDA 1604, IEC 6F22, JIS 006P battery 
Battery Life   200 hours 
Auto Power Off    approx 6 min

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