An efficient scalable networkable grow light system ensures that a DLI suitable for optimal plant growth without causing heat stress is met by selectively illuminating lighting elements of determined wavelengths, and adjusting intensity of the lighting elements, and adjusting the height of an assembly containing the lighting elements, if sensed ambient light is inadequate to meet the DLI. A hoist adjusts height to provide full illumination without causing heat stress, while reducing inefficiency due to excessive distance. If sensed ambient lighting is sufficient to meet the DLI, supplemental lighting is not activated.
