International Telecommunications Company

Software & IT Services
July 1, 2020

Seeking improvements to the lighting at a leading international telecommunications company, a Senior Property Management Engineer contacted Llumarlite looking for potential lighting solutions that would deliver on their environmental initiatives to reduce energy and maintenance costs. During an initial site visit we identified additional areas within the office that would help the client make lighting savings to their ‘in use ’lighting and suggested potential secondary cost savings.

Following on from the site visit and further discussions with the client, we developed a lighting scheme in line with the SLL LG07/15Lighting Guide 07 for office lighting to meet the needs of the building’s users. As part of our new lighting scheme proposal we put forward examples of the fixtures and controls we intended to use. This included the Amalfi LEDUGR19, a luminaire built around Circular Design Principles, that enabled us to reduce the number of luminaires in the office space delivering long term sustainability and improved comfort.

This was followed by a trial of the scheme within an area of the office. This proved the performance and benefits of adding Dimmable features to the lighting and gave the client confidence to move forward with the installation of the scheme. Working closely with the clients FM provider, CBRE, Llumarlite installed the new lighting scheme over the course of 4 weeks. To avoid any disruption to the client during the project installation took place outside of their working hours.

Llumarlite set up energy monitoring of agreed lighting circuits before and after the installation which proved a 52% saving, with the peak lighting load reduced by 70% which was in line with the savings forecast. The client has also carried out their own monitoring across all electrical services and noted an overall building energy saving of over 30%.

Monitored Lighting Circuit Loads Old Fluorescent, Switch vs New LED, Dimmed

Since completion of the project Llumarlite have been asked by the client to investigate and provide lighting and control solutions to their London offices. We will be working together to develop a new control philosophy, fitting additional input devices, and re-commissioning as recommended in CIBSE/SLL Commissioning Code L: 2018 to save energy, improve comfort and efficiency.

Aware of ageing control gear and failing lighting control equipment, a Senior Property Management Engineer at a leading international telecommunications company, contacted Llumarlite to explore potential lighting solutions. The final design needed to resolve the lighting, deliver long-term savings through reduced maintenance, energy costs and meet with the companies wider environmentally positive initiatives.

During an initial site visit we observed further opportunities to overcome other lighting issues and areas in the building, beyond the original scope, that would provide significant improvements overall. We noted that lighting savings could be made helping to reduce maintenance disruption costs with secondary cost saving potential, including reduced maximum demand, Air Conditioning load and improved comfort.

Some of the issues we highlighted included fittings within the office using 18w Fluorescent Halophosphate T8 Lamps. This dated and inefficient lamp technology provided a poor colour rendering quality of CRI 61,a colour more appropriate for industrial use rather than office.  

Luminaires had high frequency control gear, helping to reduce flicker and provide some reduction in running costs, but they also used a low efficiency reflector material, reducing the luminaires’ system performance.  

These issues combined with ageing VDU louvres and lamps created a dull working environment across the office and did not meet the current recommendations for light quality or visual comfort as outlined in the CIBSE lighting guide SLL LG7.

Corridors running through the open office utilised a variety of short-term legacy solutions, combining a mix of compact fluorescent and GU10spotlights. While the variety of styles in use did little to enhance the overall look of the area, more importantly this mix of fittings failed to provide the space with the correct illuminance requirements and had poor system efficiency. To assist with emergency escape, the space contained utilitarian surface mounted fluorescent emergency luminaires which had reached the end of their lifecycle, regularly needing battery and lamp replacement.

We discussed with the client that the lighting control system was not providing the best solution for the space, with some corridors unable to be switched off, existing presence detectors within the office workstation areas lacked the full potential that a modern dimmable system could now offer.

Conversations with the client followed, highlighting these opportunities for delivering further savings and improvements to the lighting quality within their estate. The client agreed with our recommendations and together we worked on solutions that included updating the Emergency Lighting and Signage.

To meet the client’s needs and SLL guidance for office lighting, a target level of 300 Lux on workstations was agreed upon. As part of our design process we ran our initial design concept through Relux – Light Planning Software, allowing us to demonstrate the potential savings and payback. As part of our presentation we included examples of luminaires proposed to achieve the new scheme.

We proposed using the Amalfi LED UGR 19 Luminaires for the main office. These luminaires, built around Circular Economy Design Principles, feature selectable output with LED’s, drivers and optics that are replaceable by the user, allowing them to be maintained and optimised throughout their lifecycle helping to deliver long term sustainability. Excellent glare control combined with improved colour Rendering Index CRI 80+ will this make the staff look healthier and the space feel more enlivened. A client survey showed we had improved user comfort which would reflect on their performance for the business. Without the restrictions of the old VDU reflector, the improved lighting performance of the Amalfi LED UGR 19 allowed us to reduce the number of fixtures used in the previous scheme.

For the corridors, Downlights featuring a glowing trim were selected, to help enhance the visual guidance within the space.

We recommended upgrading the existing controls from ‘switching only’ system to a new Dali Dimmable PIR/Multi sensors. This would provide better detector coverage of workstations, capping maximum illuminance to improve energy, user comfort & life, and photocell control to react to improved daylight (new windows were also being retrofitted). As the legacy control system was to be replaced, this the opportunity to upgrade existing Lighting Connection Modules to allow the additional 2-core Dali signal to be shared from the detectors. It can also be tuned for sensitivity and throughout its life.

Before the final order was placed by the client, a trial was undertaken to prove performance and comfort. This mock-up area enabled us to test the new design and provided an opportunity for us to further demonstrate the benefits of adding Dimmable features.


At Llumarlite we utilise energy data collection, allowing us to monitor before and after power loads. Our energy monitoring of agreed lighting circuits carried out before and after Christmas proved the test area reduced from 134 KWh to 64KWh – saving 70 KWh – ie 52%. Peak lighting load was reduced by 70%, which could help negotiation of a better tariff.

As this was winter time (short days/little sun), greater savings would be anticipated in summer months.

The client has carried out his own monitoring across all electrical services during the winter period and concurs with this, making an overall building energy saving of over 30%.

Good feedback has also been received from staff as the quality of their lit environment has been greatly improved

As further testimony, the current contract was extended to bring the Emergency Escape route signage, stairs and main evacuation routes inline with BS5266-1:2016. Emergency lighting was updated to cover current risk and new Fire Fighting Equipment by using a standalone miniature recessed on-maintained LED source. The lighting within in the toilets and stairwells was also updated to save energy, reduce maintenance, and visually align with the upgraded offices. Self-test DALI equipment was used, allowing future upgrade or connectivity options.

Llumarlite have since been asked by the client to survey and take back control of the lighting in their London offices. We identified there were large control zones, insufficient detectors and multiple refurbishments that had not been fully integrated, which could cause false triggering of lighting. We are currently working with the client again on a new control philosophy, fitting additional input devices, and re-commissioning as recommended in CIBSE/SLL Commissioning Code L: 2018 to save energy and comfort there too.

“Llumarlite worked with us to identify our needs, and delivered the savings promised , adding the benefits of an enhanced working environment for our staff. Throughout the installation phase, they co-operated seamlessly with our FM team and Project Manager, working out of hours to ensure there was no disruption to our employees."
Mark Yarwood CEng MCIBSE
Lead Engineer, Property Management Team