Designed by Konstantin Grcic, the ceiling, wall or track-mounted Hertz and Mini Hertz family of spotlights revolve around the AR-111 lamp, for both the low voltage and metal halide versions, allowing for precise beams of light. Housed in clear planes of acrylic, the lamps, available in 2 or 4 lamp configuration, have 360deg rotation and a 2 directional gimble.