EXTECH LT40 LED Light Meter

EXTECH LT40 LED Light Meter key features

• Measure white LED and Standard Lighting in Lux or Foot-Candle (Fc) units
• Built-in sensor with protective cover
• 4000 count LCD display
• Cosine and color corrected measurements
• Min/Max Average and Auto Power Off
• Complete with 2 AAA batteries, and pouch


(1 customer review)

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EXTECH LT40 LED Light Meter

The Extech LT40 LED Light Metre is a must-have tool for measuring and optimising environmental light levels in a variety of scenarios. Because of its adaptability, it is useful for a wide range of applications, including but not limited to office buildings, manufacturing plants, warehouses, university campuses, schools, and hospitals.

The LT40’s role in ensuring regulatory compliance is an important part of its utility. Because the Occupational Safety and Health Administration (OSHA) oversees workplace lighting requirements, light metres like the LT40 are critical in ensuring compliance. Furthermore, they aid in the assessment of compliance with state and municipal public safety rules and ordinances, fostering safer and healthier working environments.

The LT40 can measure a variety of typical light sources, including fluorescent, metal halide, high-pressure sodium, and incandescent lighting, with an accuracy of up to 400,000 lux (40,000 Fc). This large range of measurement ensures that it is applicable to a wide range of lighting technologies.

EXTECH LT40 LED Light Meter specifications

  • Foot-candle (Fc) Range 99.99, 999.9, 9999, 40000
  • Lux Range 999.9, 9999, 99990, 400000
  • LED Type white
  • Basic Accuracy ±3%
  • Dimensions 5.2×1.9×1″ (133x48x23mm)
  • Weight 8.80z (250g)
1 review

1 review for EXTECH LT40 LED Light Meter

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  1. Maya

    he Extech LT40 LED Light Meter is easy to use and appears to provide reasonable measurements.

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EXTECH meters and testers help you ensure uptime, maximize productivity and verify compliance. Whether used as a component of an effective predictive maintenance program or as a key tool for a rapid response repair team, EXTECH instruments are the meters of choice for professionals who need to solve problems. Extech continues to build brand loyalty and trust among electrical contractors, industrial mechanics, facilities maintenance, HVAC/R technicians, sustainability & safety directors, public works managers, building & restoration contractors, and more. Extech products are backed with a standard full 2-year warranty, and select products up to 3 years, against defects.


Data Sheet


Lux meter
illuminance range(Lux) range/resolution/accuracy

999.9, 9999, 99990, 400000Lux

illuminance range(FC) range/resolution/accuracy

99.99, 999.9, 9999, 40000Fc

Mechanical and General Specifications

133 × 48 × 23mm




2 × AAA (1.5V) batteries