Extech LT40 LED Light Meter
Extech LT40 Light Meter provides a simple way to measure light levels in many environments. It delivers reliable readings in both Lux and Foot Candle units. As a result, users can confirm lighting conditions with ease.
Compact design makes the Extech LT40 Light Meter easy to carry and use on site. The built in sensor includes a protective cover, which helps extend product life. In addition, the clear display allows fast reading of results.
Accurate Light Measurement
Consistent readings are supported by advanced correction features. The Extech LT40 Light Meter uses cosine and colour correction to improve accuracy across different light sources. This ensures reliable results in varied settings.
It supports Min Max and Average functions for tracking changing light levels. These features help users monitor conditions over time. Therefore, it is well suited for inspections and routine checks.
Designed For Practical Use
Ease of use is a key part of the design. The Extech LT40 Light Meter includes a 4000 count LCD with data hold to capture readings clearly. This helps users work efficiently in different environments.
Lightweight construction supports daily use without fatigue. Battery power and auto power off help extend working time, while included accessories allow use straight from the box. This makes it a dependable tool for regular testing.
Key Features
- Measures lighting in Lux and Foot Candle units
- Suitable for LED halogen and discharge lighting
- Integrated sensor with protective cover for safety
- Supports Min Max and Average reading functions
- 4000 count LCD provides clear results
- Data hold function helps capture stable readings
- Compact design supports easy handling
- Auto power off helps extend battery life
- Lightweight build improves portability
- Battery powered for flexible use on site
Technical Specifications
| Manufacturer | Extech |
| Manufacturer part code | 400A917 |
| Measurement range Lux | 0 to 400000 Lux with selectable ranges |
| Measurement range Foot Candle | 0 to 40000 Fc with selectable ranges |
| Display type | 4000 count LCD screen |
| Measurement modes | Lux and Foot Candle |
| Functions | Min Max Average and Hold |
| Sensor type | Built in with protective cover |
| Light compatibility | White LED discharge lamps and halogen lamps |
| Colour correction | Yes |
| Cosine correction | Yes |
| Dimensions | 133 x 48 x 23 mm |
| Weight | 250 g |
| Power supply | 2 x AAA batteries included |
| Auto power off | Yes |
| LED type measured | White LED |
| Basic accuracy | ±3 percent |
| Warranty | Not specified |
Document Downloads
What’s Included
- Extech LT40 LED Light Meter
- Protective cover
- 2 AAA batteries
- Pouch












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