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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
  • Large, 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 RangesLux: 0 to 199,900
Fc: 0 to 19,990
AccuracyIncandescent Light Source: ±(3% rdg.+ 5 dgt)
Other Visible Light Source: ±8% rdg.
ResolutionLux: 0.1
Fc: 0.01
Response Time500mS
Sensor TypeSilicon photodiode with color correction filter and cosine correction
Light TypesWhite LED, Yellow LED, Green LED, Red LED, Blue LED, Warm White Fluorescent, Cold White Fluorescent Lamp, Incandescent
Angle deviation from cosine characteristics10° ±1%
30° ±2%
60° ±5%
80° ±20%
AutorangingYes (Auto and Manual)
Display6-Digit LCD
Backlit DisplayYes
Data HoldYes
Overrange IndicatorYes
Auto Shut-OffYes (After 30 mins)
Low Battery IndicatorYes
Power Supply2 x AA Batteries
Battery LifeApprox. 80 Hours
Product CertificationsCE, RoHS
Operating Temperature32 to 104°F (0 to 40°C)
Storage Temperature14 to 122°F (-10 to 50°C)
Operating Humidity Range0 to 80%
Dimensions6.7 x 2.5 x 1.5" (169 x 63 x 37 mm)
Weight7.4 oz (210g)

What's included with the REED R8140

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