Why not get a Headlamp if you're going to spend tremendous time on servicing cars?
It may seem Goofy looking but it gets the job done.
After having a few American made headlamps that wasn't bright enough for me, I went on ebay an purchased a CREE Headlamp T6 LED. It runs on one 18650 Rechargeable battery. It has High, Low, Medium and Strobe setting as well. On High, you get 1 hour of super bright light. When I say super bright, it's brighter than the StreamLight Stinger C4 LED flashlights that Snap On, Matco, Cornwell, Mac Tools sells.
I have 3 sets of it, which means 3 Battery Chargers and 6 18650 Batteries always on Charge.
If you can bare with it being made oversea, you won't be disappointed upon using it.
Here's the link. I'm ordering one for my Apprentice Technician tomorrow, he wants a new one.
http://www.ebay.com/itm/CREE-XM-L-X...865?pt=LH_DefaultDomain_0&hash=item1c248dd7b9
Search keyword CREE Headlamps on the web, they have some crazy bright ones too.