Fangrui Product Details BH1750FVI Digital Light sensor module for an optical intensity sensor IC digital two-wire serial bus interface. Use of the light intensity data collection module can adjust the LCD brightness of the keyboard backlight. Resolution module can detect a wide range of light intensity. 1, the outer diameter of 26mm, the large diameter edge 28.5mm, high 26MM (plus light beads) 2, the working voltage: DC5V 2, the parameters 3, Communication Interface: I2C. 4, the input light range: 1-65535lx. 5, spectral sensitivity characteristics: Peak Sensitivity Wavelength Typ: 560nm 6, the light source dependence is weak: incandescent, fluorescent, halogen, white LED, fluorescent and can be color: White Material: metal + plastic 1) I 2 C bus Interface ( f / s Mode Support ) 2) Spectral responsibility is approximately human eye response 3) Illuminance to Digital Converter 4) Wide range and High resolution. ( 1 - 65535 lx ) 5) Low Current by power down function 6) 50Hz / 60Hz Light noise reject-function 7) 1.8V Logic input in