How to selected LED power supply?

In generally ,the LED power supply adopts constant current of given work.. that is, the maximum output current was invariable parameter (designer demands keep constant.)the output currently not going to increases with the increase of electric voltage . but power supply output voltage is rarely constant, That means the nominal value settled to values well within the output voltage’s rating.

Sale on the LED of your choice;
For example, you have a LED power supply that the output voltage from 8 volts to 12volts, output constant currently as 700mA. How to choice your LED? In this paper we have presented a ways as follows:
3Wattwith tree series connected units(led module)