Don't have an LED light on my bike, but have some experience with them. Yes, they will use less power, usually only about 10-15% of a normal bulb. It won't provide really any benefit in that area since your bike is designed to power the reg bulb and will charge the battery regardless of demand. However, if you add on accessories later like heated grips, etc., it could help lessen the overall demand. In terms of brightness, it'll only be brighter if you bought one that's brighter than your original. If it's a direct swap, then the LED light will put out the same lumens as your first bulb. The real advantage is longevity. LED lights are designed to last, some for more than a decade. One side note, they are far more sensitive to moisture and shock because of their electronic ballast. Make sure you install it correctly. Good luck!