If you're looking to brighten your Arduino projects, I recommend exploring the top light sensor modules like the VEML7700, BH1750FVI, and GY-302, which offer high accuracy and easy integration via I2C. Seems simple? There is more to a light sensor than just its definition. It comes in different types and is used in various applications! Hence, in today's light sensor guide. Light sensors, also known as photoelectric sensors or photosensors, are devices that convert light energy into an electrical signal. Some of the common frequencies are infrared, visible and ultraviolet.