ONSET HOBO Light On/Off Data Logger

OverviewThe 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

  • Product Name:HOBO Light On/Off Data Logger
  • Item No.:UX90-002
  • Manufacturers:Onset
  • Country of Origin:US


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.

Highlighted Features

  • Auto-calibration of ON and OFF thresholds ensuresreliable readings

  • User adjustable sensitivity control for low/highlight level conditions

  • Highly recommended lightpipe accessory eliminates effects of ambient light toensure the most accurate readings

  • Compatible with HOBOware and HOBOware Pro softwarefor logger setup, graphing and analysis

In what environment does this data logger operate?

This data logger operates in an indoor environment.

What measurements does this data logger support?

The UX90-002 data logger supports the following measurement: Light On/Off

Light threshold:      > 65 lux

Light type:      LED, CFL, fluorescent, HID, incandescent, natural

UX90-002- Temperature Specification ChartTime accuracy:      ±1 minute per month at 25°C (77°F) (see Plot A)

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)