NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

At what point of rated lamp life does group relamping typically take place?

1. 100%

2. 90%

3. 70%

4. 40%

The correct answer is: 70%

Group relamping typically occurs at 70% of the rated lamp life. This approach is based on the understanding that lamps can start to exhibit diminished performance as they approach the end of their rated life. By the time they reach this point, their lumen output can significantly decrease, leading to poor lighting quality and potentially creating safety hazards in commercial and industrial settings. Relamping at 70% allows for the replacement of lamps before they fail unexpectedly, ensuring consistent lighting levels and reducing maintenance issues. It is a proactive maintenance strategy that helps in maintaining optimal illumination, thereby improving operational efficiency and safety in the environment. Timing the relamping process at this stage also helps in planning and minimizes disruptions to the workflow, as well as potentially saving on energy costs by ensuring that all lamps are delivering adequate lighting.