In
light-emitting diodes, electricity is converted directly to light. Their
efficacy is increasing from year to year and one foresees that it exceeds
120 lm/W within the next decade. An other advantage of LEDs is their extremely
long lifetime.
Applications:
LEDs are
used into traffic lights and exit signs, where they will last much longer
and consume less energy than bulbs. Indoor luminaires for LED have also
appeared very recently on the market.