The lighting level of a lighting installation decreases over its service life, which is due to
lamp and luminaire degradation,
lamp and luminaire soiling,
room surface degradation and
lamp failure rates.
Maintenance
Maintenance interval planning is necessary to make sure the design specifications are met during the lighting installation’s entire useful life. For this reason, it is assumed that lamp replacements and cleaning intervals are a part of the lighting design.
Planning is based on initial luminance and maintenance factor (see chapter "Maintenance factor"). Maintenance factor and maintenance schedules must be agreed upon by designer and owner or operator at the start of the planning stage. Where no maintenance factor is agreed upon, a value of 0,8 should be used.
Luminaires should be arranged to facilitate easy access to avoid longer interruptions of sporting activities caused by maintenance or repairs.
Especially when using LED luminaires, total failure is negligible. This way, maintenance and repair efforts can be kept low. However, it is all the more important to consider luminous flux degradation. There may be very different outcomes, not solely due to the LED components selected, but also due to luminaire construction (see also chapter "The lamp maintenance factor of an LED luminaire" and chapter "LED luminaire operation").