HOBO Extended Memory Light On/Off Data Logger

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The HOBO Light On/Off data logger monitors indoor light changes with an internal sensor and records light on and off conditions, making it ideal for building energy audits and light usage analysis. The HOBO UX90-002 Light On/Off Data Logger is available in a standard 128 KB memory model (UX90-002) capable of 84,650 measurements and an expanded 512KB memory version (UX90-002M) capable of over 346,795 measurements.

Manufactured by: Onset
Model: HOBO Extended Memory Light On/Off Data Logger

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Light on/off


Temperature Sensor (MX2203)
Light threshold > 65 lux
Light type LED, CFL, fluorescent, HID, incandescent, natural
Time accuracy ±1 minute per month at 25°C (77°F) (see Plot A in manual)
Battery life 1 year typical use
UX90-002 128 KB (84,650 measurements, maximum)
UX90-002M 512 KB (346,795 measurements, maximum)
Download type USB 2.0 interface
Download time 10 seconds for 128 KB; 30 seconds for 512 KB
Logger Operating Range
Logging -20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing)
Launch/readout 0° to 50°C (32° to 122°F) per USB specification
LCD LCD is visible from: 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 3.66 x 5.94 x 1.52 cm (1.44 x 2.34 x 0.6 in.)
Weight 23 g (0.81 oz)
Environmental rating IP50
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU)