Large light-up signs use Light Emitting Diodes (LEDs) to give a bright image safely, and with low power. These signs are brighter than Neon signs, and use 70% less power - a mere 8 Watts at 110 Volts.
In addition, because the sign uses LEDs, this allows the sign to have an "Animation" mode, in which different parts of the sign can be made to blink in various sequences. Signs are light weight, and easy to hang anywhere. Note that these signs are for INDOOR use only!