Energy efficient lighting - LED luminaires

© jozsitoeroe, image #116489401, 2017, source:


Investment cost:
Low cost
Cost savings:
Annual: € 34.88 (£ 32); proportional to the number of luminaires; minimal risk as direct replacement possible, lighting quality of LED must be assured; minimal maintenance required; estimated 25 000 hour lamp service span
Investment cost:
€ 61.04 (£ 56) per luminaire, € 244.16 (£ 224) per project
Payback time:
7 years
Low cost
Resource savings: Energy:
Annual: reduced energy consumption; 354 kWh or 177 kg CO2 equivalent

Case for LED luminaires

Fitting and lamp replacement with 19 W LED luminaires. LEDs have a very long life (typically 50 000 hours) which calls for less maintenance and replacement costs.

Making lighting energy efficient can help a company achieve significant savings. Estimates show that in the UK, some 20 % of the electricity generated is used for lighting and that over 75 % of lighting installations are thought to be out of date.

Cost-effective changes include the:

  • Lighting technology itself (e.g. LEDs and organic LEDs, or OLEDs, metal halide, fluorescent, etc.),
  • Luminaires (e.g. checking that the light is well diffused)
  • Lighting controls (e.g. installing sensors for better lighting management)
  • Lighting design (e.g. over-lighting a space, or leaving lights on unnecessarily)

There are many low- and no-cost options to help save money and improve lighting operations. They range from 'quick wins' to more significant refits or investments. While quick wins' can deliver instant energy and cost savings, consideration should be given to the potential longer-term gains of a full overhaul.


Consider the three following operations:

  • New construction project: a completely new lighting installation, bearing in mind the future operational costs of the installation
  • Refurbishment: consider the long-term benefits of replacing light systems as part of other planned refurbishments, which could remove existing constraints such as ceiling type or height, space, layout for improved future gain
  • Retrofit: a project where only the lighting is reviewed, and no other works are actively pursued

EAUC-Scotland and Resource Efficient Scotland (RES), Energy Efficiency Technologies Catalogue,…

Carbon Trust (2011), Lighting,

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