APEX Certified versatile dimming control for Lumi Lite, Tech and XHO lighting units. Works with any APEX controller or can be controlled by 0-10 volt based controllers. Easy to install and set up. Simply plug the interface inline between any Reef Brite LED unit and power supply, then plug the RJ45 cable into any available VR port on your APEX system. A VDM module is not required so long as you have a VR port available on the main APEX unit. Recommended maximum load for single or dual channel models is 120 watts per channel.