- Lamp life is rated in hours of operation. If lamps are rated for 4000 hours at 12 volts, it means that at 4000 hours, 50% of the lamps are still working and 50% are not.
- For maximum light output, tune lighting circuits to provide between 11.5 and 12.0 volts as measured at lamp terminals when all of the lamps on the circuit are operating.
- For longer lamp life, adjust voltage down so lamps receive between 10.5 and 11.5 volts at the lamp terminals.
- Voltage can be regulated by adjusting circuit load/run.
- To determine circuit voltage, use a digital voltmeter.
| Volts at Lamp (AC) | Lamp Life of Rate | Lumen Output of Rated | ||||||
|---|---|---|---|---|---|---|---|---|
| 13.0 * | 50% | 350% | ||||||
| 12.5 * | 75% | 175% | ||||||
| 12.0 | 100% | 100% | ||||||
| 11.5 | 200% | 80% | ||||||
| 11.0 | 300% | 75% | ||||||
| 10.5 | 500% | 65% | ||||||
| 10.0 | 900% | 50% | ||||||
* This voltage is not recommended
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