Lights account for approximately 10 to 15 percent of your electricity bill, dependent upon how you live in your home. By only using the lighting that you need, and where you need it, you can reduce your lighting energy consumption by 50 percent.
Apart from good home design and turning off unnecessary lighting, lighting technology is making incredible advances so it is always worth checking on the latest developments when you are changing lights. You can find more specific information on lights at Use Energy Saving Light Bulbs.
Where possible, refrain from using down-lights; they are designed for spotlighting rather than general illumination - why you will have to use up to six down-lights to light the same area as one pendant light.>