Led grow lights

I feel like a complete retard, lost lika fart n a whirlwinnd. I havent grown since about 2004, and shit has changed! Looks like eveyone now grows in a tent, using leds, drivers and…a dimmer???i assume the leds use less electricity. Ill assume there is less of a heat issue. And ill assume they r very bright since a dimmer is needed. Meanwhile i should go google some info on this.