Power LEDs cannot just be connected to a power supply, the LEDs would burn out immediately. Since resistors become too hot to generate the correct steam, an LED driver is important. The LED driver ensures that the correct current and voltage is applied to the LED to make it burn.
Power Leds are single LEDs in a cluster that together can emit much more light than a standard LED. These Power LEDs need an aluminum housing or even a fan to stay cool and thus extend their lifespan.