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Extech HD450: Datalogging Heavy Duty Light Meter

Light meter with double molded housing and large backlit display with 40-segment bar graph

The HD450 Light Meter measures from 0 to 40,000Fc and 0 to 400kLux with a 0.01Fc/0.1Lux resolution. Features: 5% accuracy, Peak mode (10µs), Relative mode, Min/Max, Data Hold, backlit LCD display with 40-segment bar graph, and a rugged double molded housing. In addition, the datalogger function can automatically store up to 16,000 readings or manually store/recall up to 99 readings. Comes complete with light sensor with 3ft (1m) cable and protective cover, software with USB cable, hard carrying case and 9V battery.



  • Automatically stores up to 16,000 readings or manually store/recall up to 99 readings
  • Large backlit LCD display with 40-segment bar graph
  • Wide range to 40,000Fc or 400,000 Lux
  • Cosine and color corrected measurements
  • Utilizes 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
  • Backlight for readings in low light levels
  • Heavy Duty rugged double molded housing
  • Built-in USB port


Specifications Range
Display counts 4000 count backlit LCD
Fc Range 40, 400, 4000, 40kFc
Lux Range 400, 4000, 40k, 400kLux
Max. Resolution 0.01Fc/0.1Lux
Basic Accuracy ±5%
Cosine & Color Corrected Yes
PC Interface USB with software included
Datalogging 16,000 data (continuous)/ 99 data (manual)
CE approved Yes
Dimensions 6.7x 3.1×1.6″ (170x80x40mm)
Weight 13.7oz (390g)
Warranty 3 years


HD450 English User’s Manual

HD450 CE Declaration of Conformity

HD400_HD450 English Datasheet