GROWLIGHT
Grow light
A grow light or plant light is an artificial light source, generally an electric light, designed to stimulate plant growth by emitting an electromagnetic spectrum appropriate for photosynthesis. Grow lights are used in applications where there is either no naturally occurring light, or where supplemental light is required. For example, in the winter months when the available hours of daylight may be insufficient for the desired plant growth, lights are used to extend the amount of time the plants receive light.The above text is a snippet from Wikipedia: Grow light
and as such is available under the Creative Commons Attribution/Share-Alike License.