There's some useful info at this site:

Here is a link that might be useful: Lighting tips

Be sure to think carefully about your lighting needs - I think a lot of the guidelines call for far more lights than are really needed. My KD originally said the guidelines called for 8 can lights for my approx. 14x15 kitchen (this in addition to pendants lights at the sink, an up and down light in the fan, and under-cabinet lighting). It seemed quite excessive, so we cut the number first to 6, then down to 4. The 4 provide ample light; more would have been ridiculous. I have 2 cans in my butler's pantry, and it's almost too bright in there (and of course, they're the only lights not on a dimmer!).

One thing that might have made a bit of a difference is that I used the CREE LED 6" cans. They're expensive (run about a hundred a pop) but they are very energy efficient, don't throw off heat, are supposed to last "forever" ( supposedly 20 years) and provide a nice clean light. I'm very happy I splurged on them.

Thanks for the responses. It looks like I missed some of the old posts on this subject when I did my search. I am going to ask my architect about the CREE LED cans tomorrow!

FWIW - we met with a lighting designer this weekend and she gave us some rules of thumb. Recessed lighting for a 8' ceiling, cans should be between 4' and 5' apart. spuare footage of room x 2.5 = watts for a kitchen or bath. I think is was x 1.5 for other rooms. She really was an advocate of LED as they are now coming out inappropriate. She liked Kichler and WAC for under counter lighting. I asked about Seagull as she was not as advocate based on how they attach to the wires. Everything she said and demonstrated made sense to us. Unfortunately we have sloped ceilings and the LED cans were $$$$$. I will have to look into the CREE per recommendations above