Some species,utilize light to indicate conditions suitable for seed germination.
Light is also one of the most important environmental factors for plant growth and development.
In recent years light-emitting diodes (LEDs) have been widely used as a potential alternative light source for plants.
LED systems have several unique advantages, including the ability to control spectra composition, long operating lifetime, wave length specificity, relatively cool emitting surfaces, small size and durability.
It is known that seeds and seedlings are able to respond not only to the intensity of light but also to its quality.