Neon like LEDs are available in 5m lengths with 12volt and 24volt power suppies. They run at 9.2watts per meter and are enclosed in a waterproof flexible silicone casing.
Neon like LEDs are also available in 220volts (no power supply required). These run at 3.8watts per meter and are enclosed in a waterproof flexible silcone casing. This comes in 50meter rolls, which can be cut every meter to suit or joined and can run up to 150m off of one ACDC adapter.
All LED neon flex products are available in green, blue, orange, red, warm white and white.