Optimization of Existing Indoor Lighting Systems
Lighting
Measure Goal
The goal is to standardize the calculation of electricity savings triggered by the optimization of existing indoor lighting systems, particularly through the installation or retrofitting of presence and daylight controls, taking into account all consumption-relevant parameters.
Requirements
Only measures that meet the requirements of the Energy Ordinance (SR 730.01; EnV) can be credited. The additional requirements for the technical characteristics and for the implementation of the measure are set out in Table 1.
| Old system | New system | |
|---|---|---|
| Quality verification | - | Minergie limit value according to SIA 387/4:2023 Illuminance no more than 20% above the minimum values according to SN EN 12464-1 |
| Implementation | Planning, installation and commissioning of the new system must be carried out by a qualified specialist / company and metrologically verified after completion. | |
| Disposal | The consumption-relevant components of the old devices may not continue to be operated within Switzerland. Proper disposal or export must be demonstrable on request. | |
Proof of compliance
Compliance with the requirements must be demonstrated by the following documents. The documents listed in Table 2 are an integral part of the proof of measure implementation.
- 1.Invoice documents (PDF, PNG or JPEG format)
- 2.Explanation (PDF format, max. 2 A4 pages) of how it is ensured that the replaced devices were properly disposed of (e.g. by means of declarations, disposal items on contractor invoices, etc.).
- 3.A metrological report (PDF format) documenting the correct illuminance levels after commissioning
- 4.An energy verification according to SIA 387/4:2023. Permitted tools for this are:
Permitted tools
- https://pubdb.bfe.admin.ch/en/publication/download/11598 — A free Excel tool for calculating the energy demand according to SIA standard 387/4.
- ReluxEnergy CH — A paid calculation and verification tool for lighting installations according to SIA standard 387/4.
- https://www.lighttool.ch/ — A free online tool for calculating the energy demand according to SIA standard 387/4
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ContactSymbols, Terms and Units
| Symbol | Description | Unit |
|---|---|---|
E | annual electricity consumption | kWh/a |
ΔEeco | cumulative electricity savings | kWh |
fP | presence factor | - |
fTL | daylight factor | - |
Ns | standard effective duration | a |
Calculation Formulas
Electricity Savings through Presence Control
The electricity savings through presence control result from electricity consumption without control multiplied by the savings potential of the presence factor.
Electricity Savings through Daylight Control
The electricity savings through daylight control result from electricity consumption without control multiplied by the savings potential of the daylight factor.
Combined Control
With combined presence and daylight control, both factors are considered multiplicatively.
Cumulative Electricity Savings
The cumulative electricity savings result from the annual savings multiplied by the standard effective duration and the correction factor.