Yes, if the coach lights are E12 socket. That said, I wouldn't recommend it. The Hue lamps are not really rated for indoor/outdoor use. Exposure to elements could likely ruin the internal chips of the lamps and render then inoperable. They're a pretty expensive option for them to ruin or go bad. Also, most coach lamps utilize multiple bulbs, and Hue E12 lamps would be really costly to install - even in a single fixture. A better recommendation would be to utilize a series of all-weather LED lamps in the coach lights, and then change the control switch inside the house to a smart switch (like one from WeMo or Amazon) that con be connected to your Smart Home system and turned on/off by smartphone apps or by voice from an assistant like Amazon Echo or Siri.