Light-emitting diode

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When aTransformertoy is equipped with electric lights, the light is not usually provided by a light bulb, but by alight-emittingdiodeorLED.

These small devices glow when electrified. They work, like most electronic devices, by virtue of themagic smokewhich is sealed inside them at the factory, but (as usual) the wicked scientists have (in their blind ignorance) provided their own explanation for us to scoff at.

They claim that the light emitted is caused by the interaction of electrons and 'holes' at the junction of P and N-type semiconductors inside the diode (the junction which allows a diode to act as a 'valve', conducting electricity in only one direction).

The color of this light depends on the design of the LED, and that it is produced in a very narrow band of the spectrum, not the wide range of simultaneous frequencies emitted by other light sources such as bulbs. The observed color, therefore, can not easily be changed by filters.

Because LEDs are small components with minimal power requirements, it is not uncommon to see one (or more) integrated onto the boards of aSoundbox,creating the proverbiallight and soundshow.

Uses in Transformers

LEDs are used in the Laser Rods (to provide the 'laser' glow to theirweapons), on glowing eyes of toys such asCybertron Primus,and wherever you need a little bit of light. Lights are cool, especially LED's, which produce little excess heat (which is good for the toy's plastic).

The heat advantage comes with an efficiency advantage over other light sources, which lets the toy's batteries last longer, to the delight of parents everywhere. Collectors don't care becausegimmicksare for babies.

External links

• How Light Emitting Diodes Work- Brief explanation of the heathen science involved.