Ledtronics now offers these three-dimensional G3 series bulbs that cover their LED arrays with spherical orbs, protecting them from the elements for outdoor use. Those LEDs are pointing every which way, lighting up the area front-to-back, while using just 13 watts. Being highly efficient LEDs, they emit very little heat, too.
But you'll pay on the other side, because even though these are really durable bulbs, they'll cost you between $158 and $200 depending on the size of the bulb and which color you choose. Might be nice for some fancy schmancy garden.