The Reef Brite XHO-K30 Add-On Kit is designed to enhance the light intensity, PAR, and color of an aquarium. This kit is perfect for improving coverage and eliminating dead spots in your tank. It can be easily controlled with the Reef Brite Wireless Bluetooth LE controller (sold separately), compatible with both Apple and Android devices. Highlights of this product include dimmable XHO's, compatibility with APEX controllers (Reef Brite APEX LED interface sold separately), two 15-inch Blue Actinic XHO's, XHO-B30 brackets, a 2-way connector, and a power supply.