Are you looking for outdoor illumination, security, or style?
That's the first thing you need to determine.
I put up lights for Security and illumination. I have 3 corner fixtures for motion lights. Two on the front and one on the back side corner close to the man door, and to shine into the yard. The back corner shines into my neighbors yard, so no need. The two on the front are dual brights with 65w bulbs. They burn a low light level at night, and when motion activated go to full power. This keeps minimal light around the shop all night, but more when needed. The back corner light is a standard on/off motion light for when out walking the dog, or if someone passes it.
I also put up a 400w High Pressure Sodium light for illumination. It's awesome. Most would say more than needed, but since it's on a switch I only turn it on when needed. And when I want the light outside, I want a lot of it.
See the pics in my first post here.
http://www.garagejournal.com/forum/showthread.php?t=82831