Signal Construct SKRD05404 5mm 24VDC Blue LED Indicator Lamp

LED - Light Emitting Diode - a small light source

DC - Direct Current

LENS - An optical element which converges or diverges light

Black - A colour which does not emit any colour of the spectrum. Black absorbs all frequencies of the spectrum.

Blue - A primary colour

LED - Light Emitting Diode. A bulb that is very efficient at producing light. Often small.

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