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First you want to check the nipple position of the arc tube (inner bulb) on the lamps. On both lamps you should have the nipple pointed up and in the same direction. When standard quartz metal halide lamps are operated horizontally it is recommended to try to position the nipple in the same direction to assure a more uniform color and light output from multiple lamps.
Changing the lamps around will require some time for the lamps to adjust and stabilize. Generally requires a small burn in period. The best test for your set up is to try swapping ballast outputs. If this is a dual standard PFO magnetic ballast and the problem follows one ballast output this usually indicates that one of the capacitors within the ballast enclosure is operating out of spec. If the ballast is under warranty you want to contact PFO Lighting.
If the ballast is a standard PFO magnetic ballast (this does not apply to the HQI model) and is out of warrant you can open the ballast case/enclosure and swap the capacitors around to make sure the problem is the capacitor. If the problem follows the capacitor the capacitor needs replacement. If the ballast is old (2+ years) you should replace both capacitors to assure both ballasts will be operating identically as possible.
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