I am building a 40x60 shop with 22 ft. eaves. 20 ft. wide bays with steel I-Beam frames. Two 16 ft. doors on one side, one 16 ft. door on one end. I just installed the general lighting and I am quite happy with it. I used four fixtures hanging at about 16 ft. above the floor. I used SJ cord from the ceiling boxes down to the fixtures and plug in connectors so I can take down a fixture to work on it easily. They are hung from the beams (20 ft. apart) and 10 ft. in from the side walls, making a square 20 ft. on a side centered in the space. Each fixture is switched separately, all on one 20 amp circuit and 12 gauge wire. I used 4 ft. T5 fixtures with 4 bulbs each. The fixtures have a shiny (stainless?) reflector and a clear glass lense. I used Sylvania 6500k HO bulbs and have not had any issues with the color of the light. I believe that this is because the fixtures are installed so high that you don't see them directly.
I have white vinyl covered insulation and am installing white painted 1/2" plywood for 8 feet high around the walls, except for a full height drywall fire wall on one end, which also be painted white when they finish the fire tape.
The shop is for repairing heavy equipment and I will be using task lighting for areas shaded from the general lighting. I like LED's for task lighting because I don't have to worry about heat from the bulbs. Of course, sometimes in the winter it is nice to have a couple of 1000W halogens for radiant heat!
I have two separate circuits for "walk-through" lights. Each includes two double PAR36 fixtures with 40W halogens for instant-on and high cycles so as not to wear out the flourescents when I duck in to grab a tool or something.
By having fewer fixtures I will have less to maintain in the future. One other nice feature is that the location of the fixtures avoids blocking any light when the overhead doors are open. The lights are also lower than the two ceiling fans, so i don't get any strobe effect when they are operating.
