Lighting and energy efficiency
The rising efficiency standards and falling purchase prices of LED technology mean that businesses can now expect a shorter pay-back on their investment according to Peter Hunt, chief operating officer at the Lighting Industry Association.
Energy-efficient lighting products are particularly well suited to retrofitting applications, Hunt explains, due to the minimal disruption they cause to building fabric, and recent improvements in LED technology.
“LEDs have undergone a rapid technological evolution over the past few years and have become a much more fitting replacement for earlier light sources,” he said. “Older LEDs produced a very blue light, but modern LEDs have advanced to the point where you would be hard-pushed to tell the difference.
“Efficiency has also continued to improve. If you're comparing the output of LEDs with traditional commercial technologies such as halogen lamps, then the energy savings are now about 80%. At the same time prices have been tumbling. They've fallen 20% for three consecutive years. Lighting products that were quite expensive are now much more affordable.”
Nevertheless, a reduction in energy costs is not the only motivation for installing an energy efficient lighting system, he continued. “What many businesses overlook is the extended lifespan of new lighting technologies. Many modern LEDs can last up to 50,000 hours, compared with 2,000 hours for halogen lamps. That's 25 lamp replacements, plus the expense of calling out a maintenance engineer, which can often cost more than the lamp itself. For large commercial applications the savings can be immense.”
Improved return on investment means there is now a strong business case to switch to new technology according to Hunt: “A three-year break-even period a few years back, could now be as short as a year or less. Lighting really is the low-hanging fruit of energy-efficiency.”
Surprisingly, however, the largest savings that energy-efficient lighting can offer may in fact come from HR budgets. “There's been quite a lot of research into the link between lighting and wellbeing,” observed Hunt. “Working under light that is too bright, too dim or the wrong colour has been shown to negatively affect health.”
Energy-efficient lighting systems can help to maintain a consistent, high-quality level of illumination, explains Hunt. “The latest systems can dim down lights closest to windows when the sun is shining, for example. They also have the capacity to adjust the colour temperature of light throughout the day to match natural human biorhythms, promoting a more restful night's sleep.”
This is a point Sara Kassam, Head of Sustainability at the Chartered Institute of Building Service Engineers (CIBSE), agreed with: “With businesses typically spending 1% of their budgets on energy and 90% on staffing costs, many are realising that the big incentive for installing energy-efficiency technology may not actually be the cost of energy, but the potential it has to make staff more comfortable and productive in the workplace”.
Equally, many business leaders are recognising the potential risks from inaction on energy consumption, she explained. “Shareholders want to see a business being run efficiently. Operating outdated and wasteful technology is not good when you're looking for wider investment.”
“Energy-efficiency is also important in terms of your business' energy security,” Kassam cautioned. “Wider political issues are creating uncertainty about what will happen to energy prices in three to five years' time. Becoming as efficient as possible now cushions your business against that risk,” she advised. “After all, the cheapest unit of electricity is always the one you don't spend.”
This article originally appeared as Lighting: the low hanging fruit of energy efficiency, published on 11 January 2016. It was posted here by --BSRIA
 Related articles on Designing Buildings Wiki
- BRE Expert Collection 6 Daylight and shading.
- Building engineering physics.
- CIBSE Case Study Hepworth Gallery Lighting.
- Daylight Lighting Systems.
- General lighting v task lighting.
- Health and wellbeing impacts of natural and artificial lighting.
- Lighting and health infographic.
- Lighting energy numeric indicator LENI.
- Lighting of construction sites.
- The essential guide to retail lighting.
- Use of lighting to improve health and wellbeing.
Featured articles and news
Watch one of the first documentaries by the acclaimed Adam Curtis, examining the substandard system building of the 1960s.
Take a look at the tech start-up that could transform construction design and communication.
This house in Barcelona uses an innovative new facade tiling system to blend into the landscape.
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.
Report launched outlining steps for a national infrastructure system that is efficient, sustainable, and delivers until 2050.
A review of Justin Bere's concise and well-presented introductory guide to Passive House.
This article describes in detail the tender process for a typical commercial construction contract.
'The filing cabinet' which was labelled one of the best British buildings of the 21st century.