---
product_id: 283495370
title: "Extech LT40 LED Light Meter"
brand: "extech"
price: "€ 2.06"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.be/products/283495370-extech-lt40-led-light-meter
store_origin: BE
region: Belgium
---

# USB interface for seamless data transfer Selectable sampling rates from 1s to 24h 2 AAA batteries included Extech LT40 LED Light Meter

**Brand:** extech
**Price:** € 2.06
**Availability:** ❌ Out of Stock

## Summary

> 💡 Illuminate your workspace with precision and ease — don’t get left in the dark!

## Quick Answers

- **What is this?** Extech LT40 LED Light Meter by extech
- **How much does it cost?** € 2.06 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/283495370-extech-lt40-led-light-meter)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built for the Field:** Compact, lightweight (140g) and durable ABS design with included carrying case
- • **Customizable Sampling:** Choose data intervals from 1 second to 24 hours to fit any project timeline
- • **Plug & Play Data Mastery:** USB connectivity lets you effortlessly download and analyze data on Windows
- • **Clear, Informative Display:** LCD shows current, min/max readings and alarm status for instant insights
- • **Precision at Your Fingertips:** High accuracy ±0.5% ensures reliable light measurements every time

## Overview

The Extech LT40 LED Light Meter is a compact, battery-powered device delivering high-accuracy light measurements (±0.5%) with a versatile LCD display. Featuring USB connectivity and selectable data sampling rates from 1 second to 24 hours, it integrates seamlessly with Windows software for advanced analysis. Lightweight and durable, it’s designed for professionals needing reliable, on-the-go light monitoring.

## Description

Extech Basic Accuracy 40-40,000 FC LED Light Meter.

Review: Great meter. Seems super accurate, and quality. The cap that covers the light sensor always reads 0 and calibrates every time you turn it on. I use it for testing light intensity from my grow lights in a grow tent. I found it would have been much easier to read the lcd screen if the sensor was separated from the main module/screen. My grow plants are very close to the grow light so I end up barely being able to view the screen and the light is blinding that close so it’s hard to even read the screen if I can view it. A separated sensor just gives you more options for reading, but I understand it would be less portable.
Review: A great product at an incredible price....might have to wait awhile to find it at the sale price again...A very good LED light meter ....

## Features

- USB interface for easy setup and data download
- Selectable data sampling rates from 1 second to 24 hours
- LCD displays current readings, min/max and alarm status
- Includes Windows 2000, XP and Vista compatible analysis software

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00FF3X34M |
| ASIN  | B00FF3X34M |
| Batteries | 2 AAA batteries required. (included) |
| Batteries  | 2 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Color | White |
| Country of origin  | Taiwan |
| Customer Reviews | 4.5 4.5 out of 5 stars (164) |
| Customer reviews | 4.5 4.5 out of 5 stars (164) |
| Date First Available | 1 January 2024 |
| Date First Available  | 1 January 2024 |
| Display Style | Digital |
| Included components | Extech LT40 LED Light Meter |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 140 g |
| Item model number | LT40 |
| Item model number  | LT40 |
| Manufacturer | Extech |
| Manufacturer  | Extech |
| Material | ABS |
| Measurement Accuracy | +/-0.5% |
| Number Of Pieces | 1 |
| Part number | LT40 |
| Pattern | Thermometer |
| Power source type | Battery Powered |
| Product Dimensions | 13.46 x 4.83 x 0.51 cm; 140 g |
| Product Dimensions  | 13.46 x 4.83 x 0.51 cm; 140 g |
| Special Features | High Accuracy |
| Specification met | CE |
| Style | LT40 |

## Product Details

- **Age range (description):** Adult
- **Brand:** Extech
- **Colour:** White
- **Included components:** Extech LT40 LED Light Meter
- **Special features:** High Accuracy

## Images

![Extech LT40 LED Light Meter - Image 1](https://m.media-amazon.com/images/I/81stFVFgFmL.jpg)
![Extech LT40 LED Light Meter - Image 2](https://m.media-amazon.com/images/I/51KbWzQxt2L.jpg)
![Extech LT40 LED Light Meter - Image 3](https://m.media-amazon.com/images/I/41IpEMxaHbL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Does this item come with calibration certificate?**
A: Hello Antonio - there isn't a calibration certificate. Based on the various tests I've done the results make sense  and the machine is highly responsive. This isn't what I would regard as a precision instrument, but for my purposes g it worked fine.

**Q: Does this product come with a warranty?**
A: Hello, Thanks for your question, yes, the meter has a 2-year warranty, If you have any questions, please feel free to contact our tech support line at 866-477-3687 option 3

**Q: With the lt45 what light source setting should be used with fluorescent and sodium lights as the manual only lists incandescent and led's?...**
A: Hi, thanks for your question, there are 10 light source selections (L0 – L9) each having a unique calibration correction factor
(multiplier). See the Light Source list below. The multipliers for locations L0 through L6 are fixed
for the lighting types listed. Locations L7 through L9 are extra locations that the user can
customize (with a multiplier from 0.001 to 1.999).
L0: Standard incandescent light source
L1: LED white daylight
L2: LED AMBER (YELLOW) light
L3: LED GREEN light
L4: LED RED light
L5: LED BLUE light
L6: Not used
L7~L9: Programmable User Custom Locations (preset to 1.00) if you have any questions, feel free to contact our technical support line at 866-477-3687 option 3

**Q: Does this perform well in very bright conditions ( very sunny conditions) and in now light conditions?**
A: I feel that the Extech LT40 LED does respond fairly well in very bright conditions. As I see it, the meter is designed to read environmental conditions, such as light coming into a building or space, or even on the exterior. If you need to read just the solar conditions (visible light) in an unobstructed open space or area there are better, but often higher priced, meters for that purpose. Nick M

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by K***. on 29 November 2021*

Great meter. Seems super accurate, and quality. The cap that covers the light sensor always reads 0 and calibrates every time you turn it on. I use it for testing light intensity from my grow lights in a grow tent. I found it would have been much easier to read the lcd screen if the sensor was separated from the main module/screen. My grow plants are very close to the grow light so I end up barely being able to view the screen and the light is blinding that close so it’s hard to even read the screen if I can view it. A separated sensor just gives you more options for reading, but I understand it would be less portable.

### ⭐⭐⭐⭐⭐ Review
*by A***. on 8 December 2022*

A great product at an incredible price....might have to wait awhile to find it at the sale price again...A very good LED light meter ....

### ⭐⭐⭐⭐⭐ Review
*by C***N on 1 May 2023*

Strumento di misura dedicato per luce emessa da sorgente a led, molto valido, risulta affidabile.

## Frequently Bought Together

- Extech LT40 LED Light Meter
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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-05-17*