Douglas Manor slopes down to the water, and in September the light off Udalls Cove goes thin and clear while the lawns are still full from a summer of watering. Pacific Lawn Sprinklers works the irrigation side of a green lawn — installing and servicing sprinkler systems, tuning heads and zones so the water lands on grass instead of pavement, and shutting systems down before the cold arrives. Lawn care follows the same logic: mowing, edging, feeding and seasonal cleanups so the grass uses what it is given. On a hillside yard in Little Neck, an even spray pattern is the whole difference between green and patchy. Autumn is when the summer's tuning shows.