Originally Posted by jason1985
okay! then I am left with either putting in two 400w bulbs or selling the two ballasts.
two 400w bulbs is overkill i think and cause too much heat under the hood
agree. The total power generated by the ballast will never exceed 400W. You can run as many bulbs in parallel, but their total power absorbed should always be equal to 400W
400 bulbs = 1 watt / bulb
4 bulbs = 100 watts / bulb
1 bulb = 400 watts
Whatever number of bulbs you use, make sure to use the ones rated for the amount of wattage each will be supplied with to increase longevity of the bulbs. Dont expect a 200 watt bulb alone to last long with a ballast that supplies double the power. ie 400 watts.