Energy efficient lighting - LED

Energy efficient lighting - LED
© chones, #60825542, 2017. Source:
All sectors
Investment cost:
Low cost
Payback time:
1.7 Year(s)
Cost savings:
3€ / Annual: € 3.40 (£ 3.10)
Resource type:
Electricity - Lighting
Resource saving:
Annual: reduced energy consumption. 34 kWh, 17 kg CO2 quivalent
Investment cost:
6€ / € 6.59 (£ 6) per lamp; scale of the project proportional to the number of lamps; minimal associated risk, direct replacement possible, lighting quality of LED must be assured; minimal maintenance required; estimated 25 000 hour lamp service span
Assumptions taken in the presentation of the above performance indicators:

Low-cost option in older lighting schemes; good existing luminaires needed; single lamp replacement, 60 W GLS by 9 W LED, 600 hour annual use

The case for LEDs

Direct lamp replacement by 9 W light emitting diodes, or LEDs, which are energy efficient, ecologically friendly, low-voltage, and have a long life, higher application efficiency, and other durability advantages.

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20 % of the electricity generated is used for lighting and that over 75 % of lighting installations are thought to be out of date.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

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