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Extech HD400 Heavy Duty Light Meter

Extech HD400 Heavy Duty Light Meter
sku: HD400
MPN: HD400

Free UK Delivery On Orders Over £40
  • Built-in USB port for easy data transfer to computers
  • Large backlit LCD display makes it easy to see results
  • Cosine and colour-corrected data and measurements are available

Was: £151.74
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£124.15 Incl. VAT £148.98
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Extech HD400 Heavy Duty Light Meter Details

The Extech HD400 is a digital light meter that can measure light levels both as a footcandle and lux reading.

It also features extremely large measurement range and performs footcandle measurements across four ranges of 40, 400, 4000 and 40000FC and lux measurements across four ranges of 400, 4000, 40000 and 400000 lux with basic accuracy of ±5% rdg and max resolution of 0.01Fc/0.1lux.

The HD400 uses a precision silicon photo diode and spectral response filter to maintain measurement accuracy. The sensor of the device is connected to the unit via a 3ft (1m) cable to allow the user to easily position the sensor where it can get the best reading.

In addition to standard light measurements the HD400 also includes a few extra functions such as peak mode to capture the highest reading taken, MIN/MAX, data hold and 40-segment bargraph display.

Another version of the HD400 - the HD450 - is also available. This device does everything that the HD400 does but also includes datalogging functions for storing up to 16000 readings directly on the device.

Extech HD400 Heavy Duty Light Meter Key Features

  • Wide measurement range - 40000FC or 400000 Lux
  • Cosine and colour corrected measurements
  • Utilises precision silicon photo diode and spectral response filter
  • Peak mode (10mS) captures highest reading
  • Relative mode indicates change in light levels
  • MIN/MAX and data hold
  • Large backlit LCD display with 40 segment bar graph
  • Heavy duty rugged double moulded housing
  • Built-in USB port

Full List of Products Included

  • Extech HD400 Heavy Duty Light Meter
  • Light Sensor with 3ft (1m) Cable and Protective Cover
  • Windows Compatible Software with USB Cable
  • Hard Carrying Case
  • 9V Battery
Technical Specs

Part Code: HD400

Extech HD400 Technical Specifications

FC Range 40, 400, 4000, 40000FC
Lux Range 400, 4000, 40000, 400000Lux
Accuracy ±5% rdg
Max Resolution 0.01FC/0.1Lux
PC Interface USB
Dimensions 6.7 x 3.1 x 1.6" (170 x 80 x 40mm)
Weight 13.7oz (390g)

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OK but PC interface useless

Review by Dom (Posted on 17/03/2017)


Meter functions OK but the PC interface doesn't output data with the correct time stamp. It seems to just go as fast as it can and label each reading at the theoretical rate (i,e, if you set 1 second updates it will time stamp readings every second. Except they are actually taken every 3-5 seconds!). There is no decode of the serial data so you're stuck with it. Extech - please publish the data format!

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