LEDs are regarded as an energy-efficient and sustainable light source. However, their deployment requires professional design, planning, and implementation. We consider the main areas of use to be in small to medium-sized illuminated lettering. However, large roof installations and illuminated transparencies can be designed with ever more powerful LEDs. Single-sided illuminated signs, fascia boards, and pylons can also be illuminated efficiently. LEDs are also suitable for flat and filigree illuminates.