(I just posted this over in sci.engr.lighting.)

To get the amount of light you'll need from standard incandescent is
going to take a lot of power and many many bulbs that will need
changing often. C7 lamps would be my last choice! I'd rather put a
transformer in the cove.

My recommendation is a little on the pricey side: Dimmable
fluorescent
strips.
The best dimming ballasts (IMHO) are Lutron HiLume and can be ordered
as part of any kind of fixture you might want. There are also a good
number of fixtures built to mount inside your cove. They have just
the
right reflectors and will minimise the shadows between lamps.
For example: http://www.lamlighting.com/pdf/cove_...20Brochure.pdf
or http://www.birchwoodlighting.com/ashley.htm


Especially with a less than white ceiling, you need some serious
lighting power. (Yes, they come in 3' lengths.) Knowing how much
light
is a detailed process, getting some skilled help is highly
recommended!!


Richard Reid, LC
Luminous Views