| Micro Farad of run capacitor. | Voltage across bulb. |
| 5 mfd. | 6-7 volts ac. |
| 7.5 mfd. | 20 volts ac. |
| 10 mfd. | 27 volts ac. |
| 15 mfd. | 70 volts ac. |
| 17.5 mfd | 77 volts ac. |
| 20 mfd. | 88 volts ac. |
| 25 mfd. | 98 volts ac. |
| 30 mfd. | 104 volts ac. |
| 35 mfd. | 109 volts ac. |
| 40 mfd. | 112 volts ac. |