20mm LDR (Light Dependent Resistor)

Product Overview

The 20mm LDR is a professional-grade light sensor designed for environments where precision and durability are non-negotiable. Its massive sensing area allows it to average light levels over a wider surface, making it remarkably stable against “noise” from tiny moving shadows or flickering light sources. This model is frequently used in industrial controllers and high-end weather stations because it can handle higher voltages and power than common 5mm sensors.

How to Use & Connections

• Maximum Sensitivity: The jumbo surface area makes it exceptionally responsive to very low light levels (twilight/moonlight).

• Power Handling: Its larger physical size allows for better heat dissipation, making it suitable for circuits with higher current demands.

• Stable Integration: Pairs perfectly with a 50KΩ or 100KΩ potentiometer to create a precision light-trigger threshold for microcontrollers or analog comparators.

Technical Specifications

Key Features

• Industrial Surface Area: Captures significantly more photons than standard LDRs for high-accuracy lux measurement.

• High Voltage Rating: Capable of being used in more diverse electrical environments, including some direct AC-triggering circuits (with proper safety).

• Rugged Construction: Features a thick, high-transparency epoxy coating designed to withstand harsher conditions.

• Wide Angle Detection: Excellent for ambient light monitoring where the light source is not directional.