Signal Construct SMLD 08412 IP67 12V Blue LED Indicator

LED - Light Emitting Diode - a small light source

LENS - An optical element which converges or diverges light

Blue - A primary colour

Glass - A solid, typically transparent. Brittle and used in windows. The first patent granted in the UK was for Glass.

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

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