How many lumens per sq ft should I use for lighting?

What are you going to be doing in the garage? If you just park cars in
there, you don't need much a bare bulb in the middle should do fine, If you
want to do detailed hobby work you will need a lot more.

I'll be doing woodworking and mechanical work on cars. The garage is
540 sq ft.

Thinking of going with 100 FC/sq ft.

Gary