Abstract
Lighting design for a 3-dimensional plant factory Methods of designing lighting for 3-dimensional plant factories in which plants are cultivated by artificial light are discussed. Moving through the 3-dimensional light lattice, plants in factory of this type grow. Plants periodically approach to lamps and all leaves get light radiation from various directions. Therefore lighting environment of 3-dimensional plant factory is very complex.
Then a lighting design method is developed by the use of a model facility. First, direct incident illuminance is caluculated using the light distribution diagram for a lamp. Next, the reflected illuminance and transmitted illuminance are experimentally determined from the values of the design parameters (trough dimensions, distance between troughs, plant weight, etc). These illuminances are added to the direct incident illuminance. Finally, total illuminance is converted into effective illuminance using experimental results obtained by comparison of plants growing in 2-dimensional illuminance with those in 3-dimensional illuminance.
