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Appendix
3
Luminaire technical data block
5 Utilisation factors
The utilisation factors η B are used to give
more accurate planning of the illumination
levels within the room. They include the
luminaire operating efficiency η LB and room
factor η R . The utilisation factors (given in %),
which are listed in the table, depend on the
reflection factors (in %) of ceilings, walls,
floor and the room index k. If the reflection
factors have not been determined when
light planning, it will be necessary to
estimate. The geometrical ratio of the room
determines the room index k. It is calculated
from the length and the width of the room
(a and b) and also the luminaire height
above the usable floor area (normally 0,85 m
above the floor).
Room index k =
a x b
η x (a+b)
The conversion factor f for light output
values, luminaire light output ratio η LB and
utilisation factors η B for other lamps (e.g. T8
lamps 36W instead of 58W) and / or other
control gear (e.g. switchstart instead of HFG)
is indicated in the luminaire technical data
block.
The required number of lamps for the
desired illumination level is calculated from
the following formula:
N= E x A
0,8 x f x η B x φ
6 Power consumption
Total circuit watts for the luminaire type as
shown. The data is for conditions as follows:
25°C ambient temperature, inductive wiring,
operating at nominal voltage, stabilised
lamps, control gear at middle value setting.
The values given include the lamp circuit
watts as well as the losses within the control
gear circuit (e.g. 58 W + 8 W = 66 W). The
given power consumption is what can be
realistically expected in a typical installation.
The given values can vary within a range of
approx. ± 5% based on the variances of
control gear and lamps. Depending on the
luminaire product range different
performances from the same lamp and
same control gear are achieved under
different lamp operating conditions (see
table). For example, closed diffuser
luminaires have different thermal
characteristics to open lamp luminaires.
Generally, the power consumption is lower
within diffuser luminaires with electronic
control gear than in battens. However, the
power consumption of conventional control
gear remains reasonably constant. Only the
balance of consumption between control
gear and lamp changes. The lamp power
consumption decreases in “hot” luminaires
as the control gear losses increase.
Example:
This data refers to the temperature of a T8
36W lamp with conventional control gear.
7 Classifications
Classifications of luminaires to the DIN 5040
standard and the international CIE
publication 52.
Light beam
In addititon to the output ratio, the light
beam shape is shown for rotationally
symmetrical downlights. The form is derived
from the half spread angle (otherwise
known as the radiation angle). The half
spread angle is defined as the angle of the
rotationally symmetrical light distribution
where the light output value is half of Imax.
Half spread angle
Light output
distribution curve
Half light level (max/2)
Light beam
Half spread angle
Light output peak lmax
Luminaire: 5LR 411 7-1LA61 with 1 x TC-TEL
26W and HFG (Lumen output: 1 x 1800 lm)
N = number of lamps
0,8 = maintenance factor, considering the
aging of lamps and dirt build up
E = desired illumination level;
recommended levels are given in the
DIN 5035 standard or relevant CIBSE
code, for individual situations.
A = area or part of a area of a room
= nominal lumen output of a lamp
ηB = utilisation factor
f = conversation factor for other lamps
or control gear
Lamp ambient
Lamp voltage
Lamp current Lamp power
Output ratio
temperature
T [°C] U L [V] I L [A] P L [W] φ[%]
-10 66 0,50 26 21
25 102 0,44 36 100
60 80 0,48 33 79
80 74 0,49 32 68
Light output in cd / klm
Tested to DIN 5032
H [m] [m] E[lx]
1 1. 32 910
2 2. 63 230
3 3. 95 110
Beam angle: 67¡
Total light output ratio η LB = 69 %
The beam diameter and light output values
are shown for different distances or heights
H[m]. The beam diameter ∆ [m] describes a
circular area, where the light strength has
declined to the half of the value Imax. The
given values E [lx] are new values. They are
calculated from the light strength I0. The size
of the light beam can be classified at
different distances H [m] by the given
diameter. The data is relevant to the given
technical parameters.
appendix