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Extech
Extech LT40 LED Light Meter
Quote on request
No online payment · add lines to RFQ BOM
LT40: white LED lux to 400,000 / 40,000 Fc; ±3%; built-in sensor. RFQ.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Display
4000 count
Fc Range
99.99, 999.9, 9999, 40000 Fc
Lux Range
999.9, 9999, 99990, 400000 Lux
Led Type
White LED (also fluorescent, halogen, incandescent)
Basic Accuracy
±3%
Cosine Color Corrected
Yes
Fits workplace and facility illuminance checks where you need an Extech LT40—measures white LED and standard lighting up to 400,000 lux (40,000 Fc) with ±3% basic accuracy and a built-in sensor.
Key advantages
- Range — To 400,000 lux / 40,000 Fc
- Accuracy — ±3% basic
- LED — White LED + fluorescent/HID/incandescent class
- Form — Built-in sensor with cover; 2× AAA
- Display — Lux or foot-candle
Typical applications
- Office / warehouse lighting audits.
- OSHA illuminance checks.
- LED retrofit verification.
Selection guide
- NIST option
- vs LT45 color LED
- Quantity
Common mistakes
- Color LED scenes needing LT45.
- Sensor cover left on.
- Ignoring cosine/color correction geometry.
When to RFQ / what to tell us
- NIST option.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 39554 |
| Brand | Extech |
| Model | LT40 |
| Product type | Light Meter |
| Type | White LED light meter (Extech LT40) |
| Lux | To 400,000 lux / 40,000 Fc |
| Accuracy | ±3% basic |
| LED | White LED + standard lighting |
| Power | 2× AAA; built-in sensor |
Documents
FAQ
Q: Max lux? A: 400,000 lux.
Q: Color LEDs? A: LT40 is white LED; use LT45 for color LEDs.
Q: What should I send for a quote? A: Options/quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Display | 4000 count |
| Fc Range | 99.99, 999.9, 9999, 40000 Fc |
| Lux Range | 999.9, 9999, 99990, 400000 Lux |
| Led Type | White LED (also fluorescent, halogen, incandescent) |
| Basic Accuracy | ±3% |
| Cosine Color Corrected | Yes |
| Functions | Min/Max/Average; Auto Power Off |
| Dimensions | 5.2 × 1.9 × 1 in (133 × 48 × 23 mm) |
| Weight | 8.8 oz (250 g) |
| Power | 2 × AAA (1.5 V) |
| Warranty | 2 years (extech.com) |