You almost can't have too much light - at least when you get older.....
That said, I find that to a degree the location of the light source is more important than the brightness or color of the bulbs.
For example, you can have super bright LEDs or whatever, but when you open the hood you've just created one hell of a shadow - remember that when you think about placement. Also, you want the lights right over the benches, not in the middle of the room, you don't want the light coming over your shoulders so you're always working in your own shadow.
Trying to get real even light distribution all over the shop isn't really necessary, put the lights where they'll best illuminate where you're working and don't worry about the rest of the shop.
This example is a generally well lit shop, but it would not work for me - while the wall mounted lights might help with underhood tasks, they're still not effective.....at least for me.
This is my shop, all the major lights are over the benches, except for one right in the middle.
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I also mounted three fixture along the garage door rails, so that even with the doors up I get substantial light on the sides of the cars - you don't need them shining on the roof!
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Here's what that corner looks like, with only one 4 ft fixture.....
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Notice that even with the light on and the garage door open it's a little dark where the press is so it has it's own little task light attached to the press that I only use when I'm using the press. All of my fluorescent fixtures are hung on chains, so I can move them around to get better coverage or if I change the layout.
