TESCO Superstore

March 29, 2021

How could Llumarlite deliver greater energy savings to an efficient LED lighting system already installed throughout a building?

This was the challenge set out by TESCO to help them optimise power consumption within their flagship Cheshunt store.

The answer to this challenge laid in maintaining a project focus, detailed research and development, close partnership with TESCO and by “fully harnessing” control of the stores lighting. By developing a project specific lighting control system that integrated with the incumbent Trend system, Llumarlite have been able to optimise power consumption in the store throughout the week, delivering a saving of 36% for TESCO with a proven saving potential of up to 48%.  

The challenge

TESCO are well known for driving efficiencies and cost savings throughout their product ranges. This drive for efficiency continues throughout the day to day running of their stores. Over the past few years Tesco have been installing energy efficient LED’s across their stores, helping to reduce power consumption and CO2, but they wanted to achieve more.

Llumarlite and Tesco have a longstanding partnership, successfully working together across multiple stores within their estate.

This relationship gave TESCO the confidence to challenge Llumarlite to find a way to deliver greater energy savings from the efficient LED’s currently installed within their flagship Cheshunt store at Brookfield farm.


With the challenge laid down Llumarlite undertook an in-depth analysis of the Cheshunt store’s energy performance and existing equipment. Through on and off-site research, a comprehensive picture of how this busy store, open 24 hours for 6 days with reduced Sunday trading hours, operated and performed throughout the week.

Further development undertaken involved bench testing sample luminaires to check the compatibility and response of the existing Dali Dimmable LED Drivers within the luminaires. A fully loaded mock-up assembled off-site was used to prove the proposed Dali control system solution would operate the existing circuits which challenged the maximum number of Dali sub-address nodes. This was also used to prove our methods of control, handshake and feedback would be possible using the incumbent Trend IQ system already in place.


A presentation of the potential energy savings and a practical demonstration of the technical aspects to the project was undertaken with the key stakeholders. TESCO, happy with the results, commissioned Llumarlite to begin implementing the proposed changes. Working closely with the Cheshunt Store’s management team, the new system was installed and commissioned through a phased work plan. This avoided any disruption to the daily trading of the store.

The first phase saw the implementation of our initial research, including repair of existing equipment and careful application of the correct control philosophy to optimise the store’s timings and light levels to operational hours.

The second phase introduced dimming controls to the main store lighting. These were commissioned to maximise available savings based on site surveyed lighting levels and aesthetic feedback in collaboration with TESCO staff.


During the project power consumption data was continually monitored before and after each energy saving phase. The data gathered during each installation phase gave a clear indication of the benefits produced by each phase.  

  • Phase 1, using the latest control philosophy, optimising the store’s timings and light levels produced a measured saving of 20%
  • Phase 2, the introduction of dimming controls to the main store lighting produced a measured saving of 16%

Overall, phase 1 and 2 combined saved a total of 36%, furthermore, savings between the previous maximum load to the optimised minimum demonstrated savings potential of up to 48%”

The project proves the huge benefit and savings that can be achieved when selecting the right controls to even the latest generations of efficient LED luminaires. The existing lighting within the store has been enhanced to create the right light levels throughout the working day for both customers and staff. In addition, it has met the project goal of saving energy, while reducing the stores CO₂ emissions, saving operational costs, (i.e. reduced maintenance, longer product lifecycle) thus releasing £££ as potential capital or revenue for years to come.