A number of municipalities in the United States and Japan are now experimenting with using diodes in traffic lights.

A better option I think would be to use light emitting diodes (LED's).

The Cambridge used light-emitting diodes for its display.

The capsule also uses white-light emitting diodes as its light source.

It uses light-emitting diodes instead of a laser.

An uninterruptible power supply may use diodes in this way to ensure that current is only drawn from the battery when necessary.

The new signals use light-emitting diodes instead of incandescent bulbs.

The new flashlights that use light-emitting diodes will help you conserve juice.

An environmentally friendly structure it uses light emitting diodes, and is expected to be completed in mid-2009 at a cost of AUD450,000.

Metal rectifiers were also used as envelope detector (AM demodulator) diodes in radio receivers.