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, grow lights are used to extend the amount of time the plants receive light.
Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated. Outdoor conditions are mimicked with varying colour temperatures and spectral outputs from the grow light, as well as varying the lumen output (intensity) of the lamps. Depending on the type of plant being cultivated, the stage of cultivation (e.g., the germination/vegetative phase or the flowering/fruiting phase), and the photoperiod required by the plants, specific ranges of spectrum, luminous efficacy and colour temperature are desirable for use with specific plants and time periods.
... determine which lighting is most appropriate for optimum growth artificial light must mimic the natural light to which the plant is best adapted ... The bigger the plant gets the more light it requires if there is not enough light, a plant will not grow, regardless of other conditions ... For example, vegetables grow best in full sunlight, and to flourish indoors they need equally high light levels thus fluorescent lights or MH-lights ...
Famous quotes containing the words light and/or grow:
“It was such a leafy wilderness; a place for fauns and satyrs, and where bats hung all day to the rocks, and at evening flitted over the water, and fireflies husbanded their light under the grass and leaves against the night.”
—Henry David Thoreau (18171862)
“The holly and the ivy
Are plants that are well known
Of all the trees that grow in the woods
The holly bears the crown.”
—Unknown. The Holly and the Ivy (l. 14)