Energy efficient lighting - metal halide lamp

Energy efficient lighting - metal halide lamp
© La Gorda, image #136803138, 2017, source:
All sectors
Investment cost:
Medium cost
Payback time:
16 Year(s)
Cost savings:
294€ / Annual: € 294.30 (£ 270)
Resource type:
Electricity - Lighting
Resource saving:
Annual: reduced energy consumption; 3 000 kWh or 1 501 kg CO2 equivalent
Investment cost:
4708€ / € 130.80 (£ 120) per fitting, € 4 708.80 (£ 4 320) per project; scale of the project proportional to the number of luminaires; minimal risk, ensure lighting provided is sufficient; depending on lamp location, access for maintenance may be required; minimal maintenance required; estimated 19 000 hour lamp service span
Assumptions taken in the presentation of the above performance indicators:

Works where existing lamps are approaching the end of their service span and an energy efficient alternative is sought; installation of new fitting and lamp requiring MWEP for access, sports hall 35 m x 20 m requiring 750 lux, 40 250 W SON replacement; power density decrease from 16.5 W/m2 to 14 W/m2

Case for metal halide lamps 

Fitting and lamp replacement with metal halide lamps; a highly efficient source, typically 80 lumens per watt covering a very large range of power ratings, with a lifetime around 12 000 hours.

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20 % of the electricity generated is used for lighting and that over 75 % of lighting installations are thought to be out of date.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