BH1750 Light Intensity Sensor Module

A basic photoresistor only gives a rough, uncalibrated voltage that changes with light, leaving a project to figure out its own rough mapping to real brightness. The BH1750 instead measures light digitally and reports an actual lux value straight over I2C, matching the units professional light meters use, so a reading of 'this room is at 350 lux' means something consistent across different projects and lighting conditions without any manual calibration step. That precision makes it useful for automatic display-brightness adjustment, smart lighting that reacts to actual ambient conditions rather than a rough threshold, plant-growth light logging, and photography-adjacent light-metering projects where a simple LDR's inconsistency would be a real problem.