Universal Lighting Technologies

Appendix D: Ballast and Starter Tests

Improper Fixture Wiring

Check the wiring diagram on the ballast label.

Ballast Test

Ballast test for all mercury and 175- and higher-wattage

Metal halide fixtures (which do not require a starter):

1. Install a known good lamp.
2. If the lamp lights normally, you have corrected the cause of the problem.
3. If the lamp does not light, and all previous checks do not reveal any circuit problem, replace the ballast. Normal operation should resume. To ensure proper performance, also replace the capacitor.

Ballast and Starter Test

Ballast and starter tests for high pressure sodium fixtures:

1. Install a known good lamp.

2. If the lamp lights normally, you have just corrected the cause of the problem.

3. If the lamp does not light, disconnect the starter and install the specified TEST LAMP.

4. If the TEST LAMP lights, the ballast is good and the starter is inoperative. Replace the starter.

5. If the TEST LAMP does not light, the ballast is inoperative. Replace the ballast. To ensure proper performance, also replace the capacitor and starter.

Test Lamps for Use with HPS Ballasts Only

System Lamp
35-watt to 150-watt (55-volt, S55) 120-volt incandescent lamp of equal or higher wattage
150-watt (100-volt, S56) to 1,000-watt Mercury lamp of comparable wattage