Technology

Energy efficient lighting - T5 lamps

Energy efficient lighting - T5 lamps
© wisawa222, #83697142, 2017, source: Fotolia.com
Resources:
Energy
Sector:
All sectors
Investment cost:
Medium cost
Payback time:
4.7 - 15 Year(s)
Cost savings:
25 - 49€ / Annual: T8 to T5 replacement: € 49.4 (£ 44) Annual: T12 to T5 replacement: € 25.07 (£ 23)
Resource type:
Electricity - Lighting
Resource saving:
Case 1 (annual): T8 to T5 replacement; reduced energy consumption, improved power density; 499 kWh or 250 kg CO2 equivalent. Case (annual): T12 to T5 replacement; reduced energy consumption; 250 kWh or 125 kg CO2 equivalent
Investment cost:
117 - 724€ / Case 1: T8 to T5 replacement; € 60.38 (£ 55) per luminaire, € 724.55 (£ 660) per project; scale of project proportional to the number of luminaires; minimal risk if no change to fittings (only adapters); minimal maintenance required; estimated 19 000 hour lamp service span. Case 2: T12 to T5 replacement; € 29.43 (£ 27) per luminaire, € 117.72 (£ 108) per project; scale of project proportional to the number of luminaires; minimal risk if no change to fittings (only adapters); minimal maintenance required; estimated 19 000 hour lamp service span
Payback time:
From 4.7 years to 15 years
Assumptions taken in the presentation of the above performance indicators:

Case 1: T8 to T5 replacement; where fitting requires replacement and a lower cost, ongoing lighting option is sought; installation of new fitting and lamp, seminar room 80 m2, 18 W T8s replaced by 14 W T5s, 2 600 hour annual use, 12 luminaires; new fitting required.

Case 2: T12 to T5 replacement; where fitting requires replacement and a lower cost, ongoing lighting option is sought; installation of new ballast and lamp, four existing luminaires, two 40 W T12s replaced with two 28 W T5s, seminar room, 2 600 hours use per year

Case for T5 lamps

Fitting and lamp replacement with 14 W T5s. These lamps are ideal for high-bay or commercial troffer applications. They benefit from long life, maintenance is hassle-free, and they are some of the best energy-efficient fluorescent lighting systems available.

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20 % of the electricity generated is used for lighting and that over 75 % of lighting installations are thought to be out of date.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

Result

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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