I put a ginormous LED in my fixture. With 66 LEDs, it is very bright. The one I bought will fit in the porch light housing:
http://www.amazon.com/Brightech-Supe...SIN=B009DRJ16U
It pretty much lights up the entire underside of my awning.
The LED is too big to fit in the inside fixtures though, only the outside porch light fixture.