Late as usual to the party, but will post for future users.
My shop has six 2X8' skylights. Built it 15 years go, and no hint of a leak. Live in SoCal, so sun is the big factor for mine. I installed the lights on the North facing side of the roof, to avoid direct sunlight heat gain.
The inside is drywalled with the lights tunneled into the ceiling. Light output is great, and except for winter time, I can normally work inside the shop without using the lights until about late afternoon.
I also have five solar tubes in the house, and highly recommend them also, but not for workshop. They really brighten a darkish room, but not enough to work by.
Rick Potter
DIY journeyman,
FWW wannabe.
AKA Village Idiot.