A couple of comments on the posts so far.
1. I have used the same retractable drop light for over 40 years and it still winds up like it was new. Now quality may have been better 40 years ago, but surely someone still makes a good one. I like even better the new led or flourescent because they put off less heat.
2. Forget the halogen light clamped on the door unless you want your back and neck blistered. They put out so much heat I use them in the winter to warm up the garage. They are great in certain uses, but I wouldn't want one a foot or two from my back.
I also live and Texas and would love to have AC when working on my car, and my garage is my Man Cave even with a pool table, but I refuse to give up the space for the comfort of AC. Just an opinion, like a belly button everyone has one.