Quick answer

For most Circuit Cubes builds, standard 3mm LEDs offer a good balance of brightness, size, and compatibility. If you need more light output or specific colors, consider larger or RGB LEDs.

LED size matters for fit and visibility

3mm LEDs are compact and fit easily into small builds like the ArT Walker or Skippy. They provide enough light for indicators or accent lighting without overwhelming the design. Larger 5mm LEDs are brighter but may require more space or a wider mounting hole.

Brightness and color options affect the look

Standard 3mm LEDs come in various colors, including red, green, yellow, blue, and white. Brightness varies by color and manufacturer. If your build needs a specific mood or visibility in a well-lit room, choose a color that stands out. For projects that require multiple colors or patterns, RGB LEDs offer more flexibility but need a controller.

How to choose the right LEDs

  • Start with the build size: For compact builds with limited space, use 3mm LEDs. For larger projects where visibility is key, 5mm or even 10mm LEDs may be better.
  • Match brightness to environment: If your project will be used in bright rooms, choose high-brightness or white LEDs. For dim or dark settings, standard brightness is sufficient. Check the LED's millicandela (mcd) rating if available; higher mcd means brighter output.
  • Pick color for function or fun: Use single-color LEDs for clear indicators (e.g., red for power, green for signal). Use RGB LEDs if you want to change colors dynamically.
  • Consider power draw: Standard 3mm LEDs draw little current and work well with Circuit Cubes battery packs. High-power or multiple LEDs may require a separate power source. If adding many LEDs, test the circuit first to ensure the battery pack can handle the load.

Product facts

  • 3mm LEDs: 3mm LEDs from Circuit Cubes | Tenka Inc. are replacement parts for your builds. This listing includes two 3mm LEDs. These are a reliable, drop-in option for replacing or adding indicator lights to existing Circuit Cubes projects without modifying the build.

    3mm LEDs

    3mm LEDs

Who should choose which LED

Best for

  • Builders who need a simple, reliable indicator light for small projects
  • Users replacing a burned-out or lost LED in an existing Circuit Cubes build

Not for

  • Projects requiring very bright illumination or long-distance visibility
  • Builds that need dynamic color changing without an external controller