A greenhouse is an artificial structure made up of walls and roof made mainly of transparent materials ,and in which plants requiring regulated climatic conditions are grown.
The walls and roof of the greenhouse can be made from glass and its size can range from small sheds to industrial sized buildings.
Many commercial glass greenhouses or hothouses are high tech production facilities for vegetables , flowers or fruits.
The glass greenhouses are filled with equipment that include screening installations,heating, cooling,lighting and can be controlled remotely by a computer to optimize conditions for plant growth.
The radiation from the sun can increase the temperature of the greenhouse,increasing the amount of trapped warm air in the greenhouse.
Ventilation in the greenhouse ensures fresh air flows around in it.
This can be achieved with the aid of vents that can be controlled automatically through computers.
Greenhouses can be equipped with grow lights that the plants can use for its growth.
Examples of light sources that can be used as grow lights include the fluorescent lights , incandescents,light emitting diodes(LED) ,etc.