Motion sensor lights do not work. We used them in my parents' garden years ago. The deer just use it as an opportunity to see what they really want to eat.

I suggest something in the twelve gauge category.

If you can't shoot them; don't waste your money on
the commercial deer repellant. You can accomplish the same thing by mixing 4 eggs (shells removed) per gallon of water. From there spray the plants like you would with any other pesticide.

We did this at my parents home and it actually worked better than the store bought stuff. It also doesn't stink nearly as bad.

I never had enough of anything in my Sonoma-county garden to attract the buggers, but they used my yard as a throughway, to the consternation of my non-confrontational labrador. I'd read about phin's concoction, but here's another one: fill nylon hosiery with tufts of your hair from a hairbrush. Can't remember what it is about it they hate, but this is the one that a real backyard gardner I knew liked. She couldn't stand the stink of the egg stuff after it dried.

Don't bother shooting them unless you have several freezers handy. They're not smart enough to get the hint, so you'll have to keep packin' 'em away. Cleaning deer is much more time-consuming than filling nylon knee-highs with hair.