Instead of several bulbs to change, there is only one per light box, usually in a closet, they say. While the technology is improving, the energy savings do not yet justify the initial cost of the systems for most homeowners, according to industry experts. Most of Little's work is task lighting in commercial applications and high-end houses. Usually red or green, they are found in digital displays of products such as clock radios and dashboards. When electricity passes across the two halves, they exchange electrons that emit photons, or particles of light.
Diodes come in several colors, including white.
When grouped together in large clusters, they approximate the light of incandescent bulbs with a fraction of their energy use, Pitsor said. The only difference is that instead of a glowing filament, it is a cluster of light-emitting diodes that generates the light.