the
respec
tive time maintenance, the various
causes the decrease illuminance must
be identified.
According the formula below (1), light-
ing level required 500 standard
maintenance factor 0.
Em:
maintained illuminance =
maintenance value illuminance
(1) Enew Maintenance factor components
– Lamp luminous flux mainten. The maximum each case 1,
corresponding the new value.
All these factors describe the decrease in
illumi
nance.194
The Lighting Handbook
Maintenance lighting systems
Today, the maintenance lighting installa-
tions decisive factor installation’s
balance costs. factor LLMF
– Lamp survival factor LSF
– Luminaire maintenance factor LMF
– Room maintenance factor RMF
Causes illuminance decrease
– Ageing lamps
– Failure lamps
– Soiling luminaire
– Soiling room
The maintenance factor includes
4 components
(2) LLMF LSF LMF RMF
Benefit high MF
– lower luminaire investment costs
– reduced energy costs
Benefit low MF
– low maintenance costs
– longer maintenance intervals
Please note: lower maintenance factor,
illuminance may constantly dimmed the
maintenance value save energy (maintenance
control).67 implies a
new illuminance level Enew 750 lx.
Options for improving the
maintenance factor
– lamp replacement already before the lamp
service life ends (LLMF/LSF )
–
immediate replacement lamps case
of failure (LSF 1)
– use closed luminaires (LWF7 )
– more frequent room cleaning (RWF7 )
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