Aquatic Life Halo Saltwater LED Aquarium Light Fixtures Ocean Blue light spectrum simulating marine environments Two Channels (groups) of LED's for optimized blend of spectrum Synchronizes with the Halo Deluxe fixture through a simple plug-and-play control cable - HALO Basic may be controlled using an Aquarium Controller LED Array Structure: 25 LED (UV + Cool White + Blue + Royal Blue) Optional Halo Mounting Arms Available: MAK-24 for tank depth (front to back) of 18-24" and MAK-18 for tank depth (front to back) of 14-18"