Architecture is the application area where LEDs were firstly used with their advantages such as durability, easy control, low power consumption, and long lifetime. Nowadays LEDs are used almost everywhere. There are so many possibilities and their implementation depends on investor’s willingness to invest in such installation. LEDs create totally new appearance of bridges, facades, and other architectural areas. Their great advantage for such applications lies in their size. LED luminaires can be very small, resulting in ability to hide them in facades. In this case, they are virtually invisible, which is advantage when luminaires are switched off.