1. Introduction
During the last four decades, the technical progress in the development of light-emitting diodes (LEDs) has been
breathtaking. State-of-the-art LEDs emitting in the vis-ible spectrum are small, rugged, reliable, bright, and highly power efficient. Nowadays, illumination LEDs are predicted to be used in myriads of applications [1]. Since LED illumination inherits the advantages of standard LEDs, it offers numerous advantages, such as a consid-erable power reduction, extreme durability, size reduction, a greater degree of freedom for illumination shape, and a high resistance to shock and vibration. In addition, LED-based lighting requires less maintenance costs due to its long lifetime, and the chip per unit price of luminous flux is continuously decreasing. Due to these character-istics, LEDs have become very attractive, not only for
illumination but also for outdoor and indoor decoration and advertisement.
1. Introduction
During the last four decades, the technical progress in the development of light-emitting diodes (LEDs) has been
breathtaking. State-of-the-art LEDs emitting in the vis-ible spectrum are small, rugged, reliable, bright, and highly power efficient. Nowadays, illumination LEDs are predicted to be used in myriads of applications [1]. Since LED illumination inherits the advantages of standard LEDs, it offers numerous advantages, such as a consid-erable power reduction, extreme durability, size reduction, a greater degree of freedom for illumination shape, and a high resistance to shock and vibration. In addition, LED-based lighting requires less maintenance costs due to its long lifetime, and the chip per unit price of luminous flux is continuously decreasing. Due to these character-istics, LEDs have become very attractive, not only for
illumination but also for outdoor and indoor decoration and advertisement.
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