The best way to save on home expenses such as electricity is to make use of the natural ways of lighting such as daylight. There are devices you can put on your roof like the Solatube Tubular Technology Dome which is installed at the rooftop and uses reflective surfaces to guide daylight inside, even at a 90-degree angle.

With the Solatube Tubular Technology Dome, daytime can help you conserve more on energy with the use of natural sunlight, covering most places of your home without having to plug or switch on your lights. You can simply turn to these usual electrical lighting during nighttime, reducing the hours you have to turn them on to have good lighting in your home.

Solatube International of Vista, Calif., offers a dome-shaped product that installs on the roof and uses reflectors to bend light up to 90 degrees into the house.

(Source) Washington Post

Natural Lighting from Solatube Tubular Technology Dome