GAVITA DIGISTAR 400W EUDigiStar 400e EU Gavita DigiStar adjustable electronic ballasts guarantee maximum lamp output regardless of a fluctuating input voltage. They operate completely silent, cool, safe and are more efficient than magnetic ballasts. The DigiStar ballasts have an adjustable output power. This feature allows you to dim and boost a lamp or to use different lamp powers with the same ballast, for example a 400W lamp for vegetative growth and 600W lamp for the