US Patent 10980187 Lighting system for indoor cultivation facility

A lighting system for an indoor growing facility comprises a plurality of lighting units suspended above a growing are and a height adjustment controller operable to selectively raise each lighting unit, wherein a vertical position of each lighting unit with respect to plants positioned in the growing area under each lighting unit is adjustable to maintain a generally consistent separation between the light emitting face of each lighting unit and a top of plants positioned under each lighting unit.