DER EE light meter is a professional instrument for measuring light luminosity and lux. Equipped with a photodiode, it provides light meters with high performance of precision and sensitivity, which have a rapid and stable response speed to accurately measure light levels such as fluorescent lamps, metal halides, high-pressure sodium, and incandescent light sources. Through the color correction filter and cosine angle correction by following the C.I.E. spectrum, the light meter calculates the LED light and reads the result quickly. The handheld, lightweight, and independent light sensor design makes the light meter easily carried to any workplace to take the measurement at the best position. DER EE offers analog and digital light meter types that are optional; they will be an ideal tool for energy efficiency needs.