Are you looking for an LED power supply? There are several things you need to consider to buy the right unit. To help you, here are some things you should consider when shopping:
operation
How does the unit work? Most units operate in two modes: constant current and constant voltage.
A constant current unit provides current that can be regulated to drive the LEDs. On the other hand, constant voltage feeds a constant current driver. If you are in a unit that has both types of operations, you need to do your research to find the right one.