Feature: 1. The TSL2591 brightness sensor is an advanced digital light sensor, which is very suitable for use in various lighting conditions. 2. Compared with low‑cost CdS batteries, the sensor is more accurate, can perform accurate Lx calculations, and can be configured with different gain/synchronization ranges to detect the illumination range from 188 Lx to 88,000 Lx during flight. 3. The best thing about this sensor is that it contains infrared and full-spectrum diodes. This means user can measure infrared, full spectrum or human visible light separately. 4. Most sensors can only detect one or the other, which cannot accurately represent what the human eye sees (because we cannot detect the infrared light detected by most photodiodes). This sensor is very similar to TSL2561, but has a wider range (and The interface code is different). 5. This sensor has a huge dynamic range of 600,000,000: unlike TSL2561, you cannot change the I2C address, so keep this in mind. Specification: Item Type：High Dynamic Digital Light Sensor Very Wide Dynamic Range: 1 to 600,000,000 counts Lx Range: 188 Lx sensitivity, up to 88,000 Lx input measurement. Temperature Range: -30 to 80℃ Voltage Range: Onboard regulator is 3.3-5V Interface: I2C This board/chip uses 7-bit I2C address 0 x 29 (fixed).. Package List: 1 x Module1 x Pin Note: The built‑in ADC means that user can use it with any microcontroller even without an analog input. Very low current consumption, very suitable for low‑power data logging systems. It is about 0.4ma in active sensing, and less than 5uA in off mode.