Adafruit 1980 TSL2591 High Dynamic Range Digital Light Sensor

Adafruit-Digital-Infra-red-Visible-Light-Sensors-with-I2C-5V-ready-Adafruit-1980-p-The-Adafruit-TSL2591-High-Dynamic-Range-Digital-Light-Sensors-can-be-re-configured-to-detect-illuminance-from-188-micro-Lux-to-88-000-Lux-on-the-fly-Containing-two-sensors-a-full-spectrum-sensor-which-includes-the-human-visible-and-infra-red-wavelengths-and-an-infra-red-sensor-the-boards-allow-you-to-calculate-the-illuminance-in-Lux-This-is-handy-for-controlling-LCD-brightness-according-to-ambient-con

Price: 8.92 from Rapid Online Rapid Electronics Ltd.