The ballast is a device used to stabilize and limit the current flow of lamps, be their fluorescent tubes, sodium vapor lamps, metal halide lamps or mercury vapor lamps.
We have electromagnetic and electronic ballasts, the latter having several advantages. Its weight is much smaller. It does not release any heat. The electrical consumption was improved for consuming less. Besides that, we can improve and also in some models, differentiate the power. With it, the lamps will have a longer life meaning that you will be able to make some more crops with the same lamp.