The term GreenLight stems from the specific wavelength of the laser In this case it is 532nm. There are however, different consuls or delivery devices. The original system called the PV is no longer available. This was superseded by the HPS or High Powered System. The latest generation device was launched in 2010. Together with the introduction of the Moxy fibre this newer platform allows more energy to be delivered in a faster more efficient way. This allows larger prostates to be managed more effectively than previously.