Light-Emitting Diodes (LED)
Semiconducting materials that emit light when a current flows through them.
Performance: 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.
20 – 40 lm/W (amber and red-light LED)
10 – 20 lm/W (blue and green-light LED)
10 – 12 lm/W (white LED)