Something that I think gets overlooked in many lighting plans is control. I have seen plans in which the design and layout of the lighting is perfect. Perfect that is until you turn the lights on and they all come on with one switch.
A good example of this is a kitchen. Countless times I see plans for kitchen lighting that include only one switch. There are plenty of times you will want your kitchen fully illuminated, but not all the time. Most rooms have a focus point, a point where most of the activity takes place. In a kitchen this is usually the sink area. It is for this reason I would choose to separate that section of lighting on a separate switch. It is both economical and convenient.
Pendant lights or recessed lighting over an island are another place I like to incorporate separate control. Since they are centrally located, they are a good choice for lighting to enter the room.
The main point is you can be very creative and make a good lighting plan into a great one by simply add control options. More Lighting Tips