What you should know about lighting system maintenance (2)

maintenaceSystem 1. Group relamping with no interim replacement of lamps is particularly suitable for large ceiling areas where the failure of a few lamps does not affect the lighting level and aesthetics significantly. The individual lamp burnouts are ignored until a predetermined number of lamps fail, indicating that a group relamping is due. This system is suitable to a fluorescent source and the group replacement should not exceed 70% of average lamp life to make the best use of lumen depreciation.

System 2. A more popular and aesthetically pleasing way is to use group relamping along with interim lamp replacements. Right after a group relamping, at 80% of average life, 20% of the best remaining lamps are stored as replacements for the early burn-out lamps until the next planned relamping.

The cleaning of fixtures is often scheduled at shorter intervals than relamping, and that interval depends on several factors, including the general cleanliness of the area, the fixture design, labor costs, lamp costs and energy costs. For air-conditioned offices, cleaning every year or two years may be sufficient. Non-air conditioned offices or schools may require cleaning at least once a year.

Each fixture type has its own luminaire dirt depreciation factor, such as a recessed troffer with a lens, a recessed troffer with a louver, a suspended totally indirect fixture, etc. Thus, the design of the fixture determines the amount of dust or dirt that is collected and retained on the fixture. The dirt depreciation factor of each fixture type can be derived from the IES handbook or other industry publications.

Because a fixture is made of various materials, you should know the best way of keeping them clean. The following applies to most luminaire finishes:

Plastics-Use destaticizer. Do not wipe dry after applying rinse solution.

Glass-Use nonabrasive cleaners.

Synthetic enamel-Use detergent. Do not use alcohol or abrasive cleaners.

Porcelain-Use nonabrasive cleaners.

Aluminum-Use soap and cleaners, and then rinse with clear water. Do not use strong alkaline cleaners or acid solution.

Designing and then maintaining any lighting system involves selecting lamps that offer the most light and longest life. However, often times, a tradeoff between maximum light output and average rated life has to be made. Recent product developments include a premium line of T8 lamps with a rated life of 30,000 hours at 12 hours/start and enhanced color rendering. Philips Lighting offers another line of T8 lamps with 95% lumen maintenance and 86CRI, along with a 24,000-hour rated life.

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