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Patient room
planning example
The lighting in a patient's room must meet many require-
ments. We selected two RECOVER PRO units of 1350 mm
length in this example. The minimum requirements of the
lighting standard are only suffi cient to fulfi l the visual task
in question. Since the biological light eff ect especially con-
tributes to patients' healing success, signifi cantly higher
illuminance levels are available at the patient's eye in this
example.
In this case, the biologically necessary vertical illuminance
and age-related correction factors are considered. The
RECOVER luminaires run a full day's curve, from dawn to
dusk in the room. This activates patients in the morning
and relaxes them in the evening.
Specifi cations
Lighting standard EN 12646-1 minimum requirement
• Floor, wall, and ceiling with minimum illuminance
of 100 lx, 50 lx, and 30 lx
• Size of reading range defi ned in DIN 5035-3,
minimum 300 lx
• 300 lx at the examination level, at a height of 85 cm
for simple examinations
• 1000 lx at the examination level, at a height of 85 cm
for examinations and treatments, with a colour
rendering of Ra ≥ 90
• Glare limitation UGR ≤ 19
Room dimensions twin room:
5.66 3.6 m
Ceiling height: 3 m
Luminaire height: 1.80 m
Refl ection
Floor 40 %, walls 80 %, ceiling 90 %
Maintenance factor: 0.8
MEDI lux – what biological illuminance is required vertically
at the resident's eye?
According to DIN/TS 67600, ≥ 250 MEDI lux (Melanopic
Equivalent Daylight Illuminance) must be delivered vertically
on the eye throughout the day. MEDI lux is the melanopic and
daylight equivalent assessed illuminance.
How does one convert to visual lux?
In our example, we assume 4000 K with an MDER of 0.68.
The 250 MEDI lux are divided by the MDER (Melanopic
Daylight Equivalent Ratio) to obtain the required visual
illuminance (250 / 0.68 = 368 lx). This 368 lx is the biologically
necessary vertical illuminance for a 32-year-old standard
observer.
DIN/TS 5031-100 has two age-specifi c correction factors.
Multiplying these two factors produces 0.664 for a 50-year-
old observer. Dividing the required illuminance of 368 lx by
the correction factor for 50-year-olds gives the biologically
eff ective illuminance for 50-year-olds [368 lx / 0.664 = 554 lx].
The age-specifi c correction factors for a 75-year-old
observer result in a factor of 0.319. Thus, 1153 lx vertical
illuminance is calculated [368 lx / 0.319 = 1153 lx].
In this example, there is suffi cient vertical illuminance for a
75-year-old patient.
Measured surfaces
1 Floor
2 Ceiling
3 Walls
4 Examination level
5 Reading area
6 Visual fi eld
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Healthcare facilities
