Extech Light Meter - LT40
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Product Information
Full details
The Extech LT40 is a precision light meter designed for facility managers, safety inspectors, and building professionals who need to ensure optimal lighting environments in offices, schools, and commercial workspaces. Its primary advantage is its specialized engineering for white LED lighting, providing accurate intensity measurements where general-purpose meters often fail; however, it lacks built-in data logging capabilities for long-term automated analysis.
All features
| Model Part Number | LT40 |
|---|---|
| Brand | Extech |
Extended Product Information
FAQs
Can the LT40 measure light sources other than white LEDs?
The LT40 is specifically optimized for white LED lamps, but it may provide readings for other light sources with varying degrees of accuracy depending on their spectral output.
How do I toggle between Lux and Foot-candles?
The device typically allows for unit switching via the primary interface buttons. Please refer to the specific unit toggle button on the front panel.
Does this unit require calibration?
Like all professional measurement tools, it is recommended to have the device calibrated periodically by a certified laboratory to maintain accuracy standards.
Can I record data to a computer?
No, the LT40 is a handheld meter and does not include a data port for computer connectivity or logging.
Is the sensor detachable?
The light sensor on the LT40 is integrated into the housing for maximum durability and ease of use in the field.
Does it come with a protective case?
Please check your specific retail package contents, as accessories may vary by distributor.
Troubleshooting
LCD display is blank or faint
Check the battery level and replace with new batteries if the low battery indicator is visible or the screen is unresponsive.
Inconsistent readings
Ensure the light sensor is free of debris and that you are not casting a shadow over the sensor while taking a measurement.
Pros and Cons
Pros
- High accuracy for white LED lighting sources
- Backlit display is ideal for low-light environments
- Relative mode simplifies comparative testing
- Compact and lightweight for easy transport
- Simple interface suitable for quick field checks
Cons
- No internal memory or data logging for long-term recording
- Limited to white LED measurements
- Not intended for underwater or outdoor extreme weather use
Setup, Compatibility & Care
To begin using the LT40, ensure the batteries are properly installed according to the polarity indicators in the rear compartment. For accurate measurements, hold the sensor flat and parallel to the light source, ensuring you are not blocking the light path with your body. Clean the sensor dome regularly with a soft, lint-free cloth to prevent dust from interfering with light refraction. Store the device in a dry, cool environment when not in use, and remove the batteries if the unit will be stored for an extended period to prevent leakage.