Swisher Sweet
Active Member
I purchased two used (barely) ballasts. One ballast appears to work fine (light bright white). This is a straight 400 watt 120 volt ballast. The other comes with a 120-240 switch inside the 2nd unit that must be changed over manually. It appears to be hooked up correctly (120 volts). I have switched bulbs with the same result. It appears the light in the switchable unit is not as bright and a little yellower than the bright white and not quite as warm (heat given off by the bulb). Any idea on why this is occurring?