Energy efficient lighting - T8s

Energy efficient lighting - T8s
© wisawa222, image #90841302, 2017, source:
All sectors
Investment cost:
Low cost
Payback time:
0.9 Year(s)
Cost savings:
12€ / Annual: € 12.21 (£ 11)
Resource type:
Electricity - Lighting
Resource saving:
Annual: reduced energy consumption; 125 kWh or 62 kg CO2 equivalent
Investment cost:
11€ / € 1.42 (£ 1.30) additional per lamp, € 11.34 (£ 10.40) per project; scale proportional to the number of lamps; minimal risk, ensure lighting provided is sufficient; minimal maintenance required; estimated 18 000 hour lamp service span
Assumptions taken in the presentation of the above performance indicators:

As part of a phased installation upon failure of previous lamps; in areas with a notable lighting requirement; phased installation of energy efficient T8 lamps (30 W) into existing ballasts where standard T8 lamps (36 W) have failed; luminaires with 2 x T8, 4 x luminaires; office with use over 2 800 hours per annum 

Case for T8s

Direct lamp replacement with energy efficient T8 fluorescents, which offer up to 22 % energy savings compared to standard 32 W T8 lamps.

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20 % of the electricity generated is used for lighting and that over 75 % of lighting installations are thought to be out of date.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

Want to know if relevant support is offered in your country?