Extech LT45 Color Led Light Meter


Key Features

  • Manually store/recall up to 99 readings
  • 4000 count LCD display
  • Cosine and color corrected measurements
  • Min/Max Average and Auto Power Off
  • Complete with light sensor with protective cover and coiled cable expandable to 59″ (1.5m), 9V battery, and hard carrying case


Sampling rate: 2.5 times per second (digital display)

Display: 6-digit LCD with battery icon, measurement overload, and other function indicators

Sensor (detector): Silicon photodiode with spectral response filter and cosine correction

Ranges and Resolution

*Above 3999, the LCD uses smaller digits on the right side


Lux Foot-candles
399.9 0.1 39.99 0.01
3999 1 399.9 0.1
*39999 10 3999 1
*399999 10 *39999 10

Auto-range: The meter automatically ranges the display

Accuracy (1 Fc = 10.76 Lux):

– LED light:
± (3% of reading + 3 digits) up to 500 Lux (46Fc) ± (3% of reading) above 500 Lux (46Fc)

– Visible Light:

Calibrated to standard incandescent lamp 2856oK at an ambient temperature of 23oC

± (6% of Reading + 3 digits)

Angle deviation from cosine characteristics

(Cosine Angular corrected per JIS C 1609:1993 and CNS 5119 general A class)

30 ○ ±2%
60 ○ ±6%
80 ○ ±25%

LED Types: Meter measures white, red, yellow, green, and blue LED light

Operating conditions: Temperature: 41 to 104oF (5 to 40oC); Humidity: < 80% RH

Operation Altitude: Up to 2000m (7000’)

Storage Temperature/RH: 14 to 140oF (-10 to 60oC); Humidity: < 70% RH

Battery status indication: Battery symbol appears empty when battery voltage reaches critical level

Power supply: 9V battery

Auto Power OFF: Meter powers down after 5 minutes of inactivity (can be defeated)

Dimensions: Meter: 1.5 x 2.2 x 5.1” (38 x 55 x 130mm); Sensor: 9.8 x 2.2 x 3.1” (25 x 44 x 80mm); Cable length: 4.9’ (1.5m)

Weight: Approx. 8.8 oz. (250g) with battery installed

Introduction Extech LT45

Measure the Illuminance of White and Color LED Lights

The LT45 LED light meter is useful for measuring and optimizing environmental light levels in a wide range of environments, including office buildings, manufacturing plants and warehouses, university campuses, schools, hospitals, and many other locations. OSHA regulates workplace lighting because illumination must be adequate for assigned tasks, and light meters are used to verify regulatory compliance, as well as state and local public safety codes and ordinances. Use of LED lighting is on the rise because it is more efficient to operate, it emits stable, high quality illumination, and the technology is dropping in price. The LT45 comes with a 9-volt battery, protective sensor cover, hard case, and user manual.


– Overload Indication: LCD screen will show “OL” at the upper left-hand corner
– Battery strength status indication
– Display Update Rate: 2.5 times per second
– Spectral response near CIE luminous spectral efficiency ratings
– Cosine Angle corrected
– Conforms to JIS C 1609:1993 and CNS 5119 general class A Specifications
– Measures the intensity of illumination of white, red, yellow, green, and blue LED light and visible light in Lux or foot-candles
– Calculates Luminous Intensity (CD)
– Data hold freezes displayed reading
– Maximum/Average/Minimum Memory Hold
– Zero adjustment
– Auto power off with disable function
– Automatic range adjust optimizes accuracy and resolution
– Manually store/recall up to 99 readings
– Complete with light sensor, protective sensor cover, and coiled cable expandable to 59” (1.5m), 9V battery, and hard shell case

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