The 5mm piranha led is also known as the superflux led as well. This style led is extremely popular in sign lighting, not saying that it is the only option though. You definitely cant go wrong with it. It is also used in flood light applications. A couple other uses are brake lights, turn lights, etc.... The 5mm pure green piranha LED is sure to be a good choice.Despite the specifications of these lights, they put out an enormous amount of light and are very popular.