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Vleadteck Digital Electronic Ballasts have the ability to be dimmed. Dimming is one the best ways for dealing with heat issues in your garden. It is important to know that you can only lower the wattage while dimming a lamp. For example, a 1000w lamp can be lowered to 750w, but at the same time, the wattage cannot be increase back to 1000w. So it is recommended that the ballast should be shut off before turning up wattage or changing its setting.