Round Semi-Circle Backlight LED - 50mm Diameter

A 50mm diameter plastic diffused backlight LED that produces near-uniform white illumination from a slim semi-circle of acrylic. Originally designed for LCD gauge displays, these backlights are encased in a 2.2mm thick diffusing acrylic that spreads light evenly from just two internal white LEDs.

A built-in reflector on the flat side directs all light output through the top surface, maximising brightness. Drive it just like a standard LED at approximately 3V and 30mA. The diffused surface can be masked with vinyl, drawn on with markers, or tinted with colour gels for creative effects — making it a great alternative to EL panels for wearables without needing an inverter.

Key Features

• Uniform Diffused Light – Special acrylic evenly spreads light from two internal white LEDs
• Built-In Reflector – Flat-side reflector directs all light upward for maximum brightness
• Simple to Drive – Operates like a standard LED at ~3V / 30 mA
• Customisable – Mask with vinyl, draw with markers, or use colour gels to change the hue
• Brighter Than EL – Higher brightness and lower power consumption than electroluminescent panels, with no inverter required

Specifications

• Diameter – 50 mm
• Thickness – 2.2 mm
• Shape – Semi-circle (dome top, flat reflector bottom)
• LED Colour – White
• Operating Voltage – ~3V
• Operating Current – 30 mA

Ideal For

• Wearable electronics and costumes
• Custom indicator lights and gauge displays
• Art installations and light-up projects
• Backlighting for small LCD panels

Package Contents

• 1× Round Semi-Circle Backlight LED (50mm)