5mm Photoresistor Light-Dependent Resistor (LDR) – CdS Photoconductive Cell

Easy-to-Use Light Sensor for DIY Projects

This 5mm photoresistor, also known as a light-dependent resistor (LDR) or CdS cell, is a reliable and simple optical sensor ideal for a variety of electronics projects. Its resistance decreases as the surrounding light level increases, letting you easily detect and measure light or darkness in any environment.

Features & Key Benefits

• Easy Light Sensing: Detects changes in light levels. Great for automatic lighting, night lights, and light-activated alarms.
• Arduino & Microcontroller Friendly: Effortlessly connects to Arduino, Raspberry Pi, PIC, AVR, and other analog circuits.
• Versatile Usage: Perfect for DIY electronics, classroom demonstrations, science projects, and educational kits.

Technical Specifications

• Model: GL5528 (VUPN6550)
• Diameter: 5mm
• Light Resistance (10 Lux): 10kΩ - 20kΩ
• Dark Resistance: 1MΩ (minimum)
• Maximum Voltage: 150V DC
• Maximum Power Consumption: 100mW
• Operating Temperature: -30°C to +70°C
• Spectral Peak Wavelength: 540nm (green light)
• Response Time: Rise - 20ms, Down - 30ms

Common Applications

• Light-sensitive switches (dusk-to-dawn sensors, automatic lighting)
• Brightness detection for touchless controls
• Science experiments and school projects
• Ambient light sensing in electronic circuits
• Part of automatic headlight and display dimming circuits

Why Choose This Light-Dependent Resistor?

This photoresistor (CdS cell, LDR) is a must-have for hobbyists, students, and anyone starting out with electronics. It's affordable, sensitive, and intuitive to use for measuring light and building interactive projects—no advanced skills needed. With a wide voltage range and fast response, this sensor brings your light-sensing ideas to life!