In Part 1, we discussed group relamping. In many companies, it’s been standard practice for decades. Some companies still don’t do it, some are stretching deferring existing schedules to “save money,” and others are considering running lamps until failure. The question the decision makers ask is, “Why discard perfectly good lamps, just because a calendar date rolls around?”
The answer is the lamps aren’t perfectly good. You can confirm this by taking lumens readings right after a relamping and again right before one takes place.
Your maintenance program should include more than just these lumens readings. It should include a lighting survey, perhaps annually. The point of having a lighting system isn’t so you can say the lamps and ballasts are working per design, but so that people can easily see what they’re doing.
Among the factors that impede the effectiveness of a lighting system:
- Dirty lenses and dirty shades.
- Improperly set shades.
- Changing of office or production floor configuration, without corresponding relocation of light fixtures.
- Low power factor, low voltage, overloaded neutrals, and harmonics.
- Dirty floors, walls, and ceilings (light, instead of being reflected into the room, is absorbed in the dirt).
A lighting survey can confirm such issues are adequately addressed (or not), and reveal weaknesses you might not find any other way. A thorough survey isn’t just a matter of taking lumen measurements, though such measurements are essential. Ask your distributor to help you find a lighting survey expert.