The GL5549 is a photoresistor manufactured by Senba. It is a through-hole device with an operating voltage of 150 VDC. It has a resistance of 100-200 KO at 10 lux of illumination and 10 MO at 540 nm wavelength. It is RoHS compliant, meaning it is manufactured without using certain hazardous materials. The GL5549 is used mainly in applications where it is necessary to measure the intensity of visible and infrared light, such as in photoelectric sensing, daylight and dusk dynamics, alarm systems, and automotive lighting control.