Many people spend a great deal of time and money decorating and furnishing their homes to create an atmosphere, only to find something is missing. Good lighting will complement and complete the effect you are seeking but remember that bright lighting is not always best.
A light source creates a pool of light but there is a second effect produced when this light is reflected by other surfaces. It is this secondary effect which cannot be reproduced in the shop where you buy your lights. Consider where you plan to position the light and the surfaces under and around it. What effect will the reflected light have?
Avoid hard contrasts which can be tiring to the eyes and where possible, try to combine different types of lighting in the same room. Direct light for reading or working; pools of light to highlight features such as pictures or objects; and washes of light on walls all help to add atmosphere to a room whilst remaining functional. If a room has to perform several functions, consider installing a dimmer. This will allow a higher light level for working or reading and a lower level for relaxation. This can prove useful too for older eyes which need more light.
Colour is most important. Incandescent bulbs help create a cozy atmosphere in living areas whilst fluorescent lamps give a cooler, more efficient light for utility rooms. A room painted in dark colours will need more light as much of it will be absorbed, whilst lighter colours reflect light. You can add colour to a room by illuminating a coloured surface.