I am doing a little homework on the lighting factor. California passed requirements in 2005 called Title 24. It requires the use of energy efficient lighting throughout the home. For example, lighting in the kitchen must come from 50% CFL and this is measured in wattage, not number of units.
In looking online for information about these requirements, I found a fun site from GE called the "Virtual Lighting Designer." This page lets you compare two rooms side by side using various types of lighting (recessed, pendant, table lamp). You can also select various rooms to test the lighting in such as home office, hallway, family room.
These pictures compare (first picture) using a general table lamp with decorative lighting from a floor lamp, wall lamp (second picture).