Technical information

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Light planning
Instructions for planning and calculations
Interpretation of the calculation result
1. Scrutinise carefully
To prevent glare – check the luminance conditions in the room. •
2. Maintenance factor
Has the maintenance factor been adapted to a maintenance plan •
for the lighting installation?
NOTE! The maintenance factor aects the lighting system’s energy
consumption.
3. Calculation conditions
Have the conditions for the lighting calculations been checked?•
Has the size of the working area and immediate surroundings •
been established?
Has the calculation area for the peripheral area been defined?•
Have the room surfaces’ reectance values been checked?•
Has the luminaire’s average luminance been checked in rooms •
used for monitor work?
4. Uniformity demands
When calculating the illuminance uniformity i.e. the ratio between •
the minimum value and the average value in the working area
and the immediate surroundings, it is important that the distance
between the calculation points is documented. For normal work-
ing areas a maximum spacing of 0.25 metres between calculation
points applies.
5. Graduation implication
Use the scales for illuminances and luminances stated in the •
standard EN 12464-1.
6. UGR-glare index
Check, where appropriate, that the system’s average glare index •
conforms to the value stated in the standard.
Checking the lighting installation
1. Scope
What should be evaluated? Electric lighting, emergency lighting, •
daylight conditions, functionality and control, maintenance plan,
electrical eciency, etc.
2. Conditions•
Regarding the control of new systems, which conditions applied •
when planning?
Evaluation of existing systems?•
Evaluation with or without daylight?•
Are the measured values new values or maintained values?•
3. Implementation/checks with light measurement
Illuminances – mean value/uniformity for the working area, •
immediate surroundings and the lowest illuminance within
peripheral areas.
Luminaires’ mean luminances.•
Calculate where appropriate the UGR-glare index.•
Luminance conditions in the premises.•
Luminaire’s cut-o angle. •
Light sources’ colour reproduction and colour temperature.•
Perform visual evaluation and interview personnel.•
Perform a functional check.•
Check the calibration, burn-in time and prevailing operating condi-•
tions before light measurement.
Flow chart for light planning
1. Analysis of the planning objective
Dene the activities and dierent visual work that may be per-•
formed in the premises at dierent times of the day.
Define the lighting demands with regard to safety, visual needs •
and the visual experience.
Examine the need for emergency lighting. Define the aims for en-•
ergy consumption, environment and maintenance of the lighting
installation.
2. Analysis of planning conditions
Define applicable provisions, standards, recommendations as well •
as special demands from the client and users.
Dene the conditions for lighting the room, the type of workplace •
and its working area, etc.
Investigate the conditions for the premises’ design, furnishings, •
type of monitors, flexibility, daylight and the character of the
premises.
Establish the economic prerequisites for the installation and the •
maintenance conditions for the lighting installation.
3. Overall planning
Investigate the conditions for interaction between electric light •
and natural daylight. Check the possibility of daylight screening.
Investigate which light sources, luminaires and lighting systems •
best satisfy the demands aims and conditions.
Investigate the possibilities for lighting control to increase comfort •
and improve energy usage.
Investigate the overall co-ordination with other installations, •
colour setting and furnishings.
4. Detailed planning
Evaluate the dierent lighting systems; technically, visually and •
economically.
Establish the lighting system’s optimal maintenance factors taking •
the maintenance conditions into consideration.
Make a nancial evaluation by calculating the life cycle costs •
based on the investment, operation and maintenance.
Compare the selected lighting systems with regard to other instal-•
lations, colour setting, furnishings and the chosen equipment.
5. Documentation
Should be prepared as shown to the right with supplements ac-•
cording to the client’s wishes.
Include Installation drawings, control and assembly instructions as •
well as associated lists of light sources and luminaires.
Lighting calculations and visualisations that verify under which •
conditions the system operates to the specified demands.
Present calculation prerequisites and the lighting system’s mainte-•
nance plan (see instructions in the Lighting template).
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