The LM-100 is a portable, easy-to-use digital light meter that measures visible light from sources like fluorescent, metal halide, high-pressure sodium, or incandescent lamps. It offers a wide measurement range up to 200,000 lux or 20,000 footcandles, with a high resolution of 0.01 fc/lux. The device uses a silicon photodiode sensor, providing an accuracy of ±3% for standard incandescent lamps and a sampling rate of 2.5 times per second. Key features include switchable units, a data hold function, a MAX reading display, and a large 3-1/2 digit display. The LM-100 is ideal for measuring illumination levels to manage and improve the efficiency of lighting systems in various indoor environments.