Avoid fluorescent. They have a problem when it gets cold out. I'm thinking of the 40 watt tube-type. I don't know how the new CF screw-bulb replacements work in the cold.
Use sealed outdoor switches, even if it's inside.
Yes, florescent usually don't operate well in extreme cold. However they do not put off a lot of heat in the summer. Once they are lit will stay on fine when temps drop. They usually don't cost as much to run as incandescent bulbs either. Combination of both types are sometimes nice as long as they are on separate switching circuits. Yes, Incandescent should be caged type.
TIP: Keep electric wire away from horse access. Put up guards to prevent curious or board horses from nibbling the box. Installing outlets near the/or on the ceilings between stalls for summer time fan installation. That way it is easier to keep the electric cords out of horses reach while still giving a neat and tidy appearance.
Lots of light in the grooming area such as in the cross-tie area, if you have one inside the barn. When the days are shorter you'll appreciate the extra light to inspect feet etc... One light directly over head usually doesn't cut it. It casts shadows below (belly, feet, & legs).
Also if you have a water hydrant inside your barn, install outlet close by for heat tape to keep pipes from freezing.
Another thing if you have outside water troughs that need heaters in the winter, make sure you have an outlet for them in a convenient place.
And, Motion detectors out side the barn with flood lights.
And, Ceiling fans.
If you for some reason you may want cameras for monitoring (such as foal watch) , easier to put the electric in all at the same time then add-ons later.
