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Example of patient
room planning
Draw inspiration for the design of comfortable patient
rooms from the examples of planning options using the
VITA MED bed light.
In the current fl oor plan of a two-bed room, the beds are
placed slightly off set against opposite fascia panelled
walls. The VITA MED bed light is mounted, at a height of
180 centimetres, as a continuous duct on the fascia panel.
Three VITA MED light insets for each bed provide pleas-
ant, indirect light upwards. A light insets, in the centre
above the bed, provides direct light downwards.
Lighting Specifi cations
• Very good colour rendering CRI ≥ 90 / optional CRI ≥ 98
• Dynamic intensity gradients using the DALI light control
• No glare
• Ceilings and upper wall surfaces are brightly illuminated
• Examination light meets the requirement of < 500 lx
• Illuminance: All specifi cations in EN 12464-1:2021, both
the minimum values and the modifi ed values, are
exceeded
• Melanopic response: The required vertical and
cylindrical illuminance levels are met in accordance with
the age correction factors for 75-year-old observers in
accordance with DINT/S 5130-100
Specifi cations
Room dimensions
3.33 x 5.75 m
Ground surface area = 19.14 m2
Room height = 3.45 m
Planning examples
MEDI Lux – what is the biological requirement for
vertical illuminance on a patient's eye?
MEDI Lux is the melanopic and weighted daylight-equivalent illuminance.
According to DINT/S 67600, 250 MEDI Lux (Melanopic Equivalent
Daylight Illuminance) must be present vertically on the eye for a number
of hours in order to achieve the required biological eff ect.
How is this converted to visual lux? In our example 4000 K is assumed
with an MDER of 0.836. The 250 MEDI Lux value is divided by the melan-
opic, daylight-equivalent response factor of MDER = 0.68
[250 / 0.836 = 299 lx]. This 299 lx is the biologically necessary vertical
illuminance for a 32-year-old observer.
DINT/S 5031-100 lists important age-specifi c correction factors. For
a 50-year-old observer, this results in a vertical illuminance of 450 lx
[299 lx / 0.664 = 450 lx].
The age-specifi c correction factors for a 75-year-old observer
result in a factor of 0.319 – this gives a vertical illuminance of 937 lx
[299 lx / 0.319 = 937 lx].
This means that in our planning example for a biologically and functionally
ideally illuminated patient room, an appropriate vertical illuminance is
given for a 75-year-old observer.
Measurement area
Floor
Ceiling
Walls
Examination level / H = 85 cm
Reading range / H = 110 cm / 30 x 90 cm
Field of vision / Vertical patient head measurement area / 30 x 30 cm
Staff / Cylindrical nursing staff measurement area / H = 160 cm
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