I’ve had deer problems for a couple years now and this has finally ended. I bought a light socket from Lowe’s that has a motion detector on it and a portable motion detector with alarm (audible) from Radio Shack cat. no. 49-426. The audible portable motion detector (9v battery) has a 100 degree angle coverage so works well covering the approach angles to the garden. They are both under the roof of my patio. The small flood light is very bright and cuts itself off after 10 minutes with no motion.
All right! That’s the first successful description I’ve read regarding deer. Congratulations.