Variable 0-60sec delay motor. Reduce the lamp to plant distance without burning the tender growing tips of the plants. Increase the penetration of the correct intensity light below the plant canopy. Keep the ratio of red to far-red light even below the plant canopy. Increase yield due to increased budding sites . Healthier, more even growth patterns - higher yielding plants. Increased air flow due to the movement of the lamps heat - decreased fungal growth.