When I was troubleshooting a 1000w 240v MH luminaire, with a capacitor in series with the lamp on the secondary of the ballast, I measured my lamp socket to see my output voltage (yes I used meter rated for over 1000v) and I was getting 285v. Previously I put a new lamp and it didn't light so I checked the cap and it was good. So am I understanding this right in that the ballast had to have shorted out partially and that is why I was still getting a voltage above line voltage? What are some of the symptoms for a luminaire when the cap goes bad? Does it just not fire up? Does the capacitor in series just create impedance to limit the lamp current?