Gavita Master EL1 Gen 2 bulbs *Internet Connection Note: TrolMaster's main 8565 *Internet Connection Note: TrolMaster's main controllers can be connected to the internet in order to use the available APP Supplementing your preferred nutrient program with Cal Mag™ Plus is strongly recommended when using reverse osmosis water and when growing in coco coir based medias to compensate for natural calcium draw High temperature dimming and safety feature shut off Event logging Independent sunrise and sunset settings Independent light cycles and Programmable External Contactor Modules (ECMs) on the EL2 These controllers feature improved and expanded functionality that raises the bar