The retirement home I started my electrical apprenticeship wiring up had a whole slew of 100W PSMH fixtures outside for perimeter lighting.. They worked well BUT we found that a momentary power interruption caused the line current to almost double while the ballasts were trying to re-ignite the lamps, causing the breakers feeding the lighting to trip open.. I don't know if this was just an isolated case with only one manufacturer of ballasts, but it may be worth checking into.
A.D
