Emergency Ballasts
Stepdown transformers are simply a piece of equipment that takes a high voltage and lowers it to power a light source.
Emergency Ballasts are generally used in a fixture that provide a amount of power for 1 or 2 bulbs in the fixture (usually 90 minutes) in the event of a power outage. They are rated in lumens.
Ballasts for lighting applications are simply transformers to provide the right voltage and current mix to the gases inside the light bulb. They are commonly used in commercial ...