Reed R8140 LED Light Meter


SKU: R8140


Reed R8140 LED Light Meter

(Replaced Reed YK-10LX)(Replaced Reed R8120)

Reed R8140 Datasheet (PDF)

Auto-ranging LED light meter with detachable and rotatable sensor that allows for one-handed operation.

REED R8140 Offers

This LED Light Meter is capable of measuring popular light sources including white, red, green, yellow and blue LEDs up to 199,900 Lux (19,990 Fc). The R8140 includes an auto-ranging feature to optimize resolution and keeps track of minimum and maximum readings. This instrument is also capable of measuring standard incandescent light sources.


  • Measures ambient light levels of white, red, yellow, green and blue LED light and visible light in Foot-candles or Lux
  • Backlit LCD display
  • Detachable and rotatable light sensor
  • Min/Max and data hold functions
  • Cosine and color corrected measurements
  • User adjustable parameter for specialized light sources
  • Low battery indicator and auto shut off

REED R8140 Specifications

Measuring Ranges Lux: 0 to 199,900
Fc: 0 to 19,990
Accuracy Incandescent Light Source: ±(3% rdg.+ 5 dgt)
Other Visible Light Source: ±8% rdg.
Resolution Lux: 0.1
Fc: 0.01
Response Time 500mS
Sensor Type Silicon photodiode with color correction filter and cosine correction
Light Types White LED, Yellow LED, Green LED, Red LED, Blue LED, Warm White Fluorescent, Cold White Fluorescent Lamp, Incandescent
Angle deviation from cosine characteristics 10° ±1%
30° ±2%
60° ±5%
80° ±20%
Autoranging Yes (Auto and Manual)
Display 6-Digit LCD
Backlit Display Yes
Data Hold Yes
Min Yes
Max Yes
Overrange Indicator Yes
Auto Shut-Off Yes (After 30 mins)
Low Battery Indicator Yes
Power Supply 2 x AA Batteries
Battery Life Approx. 80 Hours
Product Certifications CE, RoHS
Operating Temperature 32 to 104°F (0 to 40°C)
Storage Temperature 14 to 122°F (-10 to 50°C)
Operating Humidity Range 0 to 80%
Dimensions 6.7 x 2.5 x 1.5″ (169 x 63 x 37 mm)
Weight 7.4 oz (210g)

What’s included with the REED R8140

  • LED Light Meter
  • Detachable Sensor
  • Sensor Cover
  • Hard Carrying Case
  • 2 x AA Batteries

Ideal Applications for the REED R8140

  • OSHA work environment compliance
  • Cinematography and photography applications
  • Museum exhibits
  • Lighting system installation
  • Environmental monitoring
  • Interior design projects
  • Industrial applications

Additional information

Weight 4 lbs
Dimensions 14 × 14 × 10 in

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