How to tell if christmas lights are led?

To identify if Christmas lights are LED, look for these signs:

Look at the Bulb Shape and Size

• LED bulbs are often smaller, more compact, and have a plastic lens rather than glass.
• They may have a slightly squared or faceted look (to help with light diffusion).

Check the Label or Packaging

• Look for terms like “LED”, “light-emitting diode”, or “energy-saving”.
• Wattage listed will usually be much lower than incandescent lights (e.g. 4W for a long LED strand vs 40W+ for traditional).

Plug Them In and Observe

• LED lights are usually brighter and have a more focused, pinpoint glow.
• Colors might appear crisper and cooler, especially white LEDs which often have a bluish tint (unless they’re “warm white”).
• Feel the Heat
• After being on for 10–15 minutes, LEDs stay cool, while incandescent bulbs get hot to the touch.

Check the Wiring and Build

• LED sets often have rectifiers or resistors in the wiring.
• The light may also flicker slightly to the naked eye (especially in cheaper models), due to the way the power is regulated.