Neptune Systems VDM Variable Speed Dimming Module/Aqua Illuminations Compatible. The Variable Speed/Dimming module (shown above) allows for the control of the Aqua Illuminations LED lighting systems as well as adding an additional 4 0-10V variable speed ports.: * Independent control of the white and blue Aqua Illumination LEDs. * Simulate Sunrise/Sunset, Lunar Cycle, Clouds, and Lightning with the Aqua Illumination LEDs. * Adds 4 independent 0-10V variable speed ports to the Apex system. * Plug and Play. Automatically recognized when installed into the system. * Pumps can be dynamically added/removed from the system. * Two AquaBus connectors for flexible expansion via AquaBus. * Comes with 3' AquaBus cable. * Fully upgradeable. * Led Status indicator. * Compatible with Apex and Apex Lite systems.