Implementing a well-planned lighting strategy through fit-out design can deliver multiple benefits:
Reducing energy consumption, cost and carbon emissions.
Maintaining or improving EPC ratings, thereby reducing regulatory compliance risk from MEES.
Maximising daylight whilst minimising glare can support a comfortable and enjoyable working environment.
Selecting appropriate lighting type, intensity and colour that support human health, wellbeing and productivity; such as reducing headaches, eye strain and stress, as well as improved alertness.
Matching type of activity to illuminance levels or using smart controls can provide tailored visual comfort, improve employee satisfaction, and optimise energy efficiency.
Creating different functional and character spaces can encourage increased active movement and employee engagement.
A good lighting design considers the various tasks to be performed within the office space and identifies any special lighting considerations (e.g. graphic design work). Typical activities/areas which could need specific lighting and controls strategies may include:
CIBSE LG07/15 Lighting Guide 07: Offices provides information on designing for flexibility within office spaces.
In addition to setting the right lighting requirements for different spaces, fluctuating light levels moving between spaces can also impact the visual comfort of occupants and could lead to eye fatigue. Sudden increases and decreases in brightness that can cause a high level of visual discomfort should be avoided. WELL L02 Visual Balance recommend reducing this issues by ensuring:
An overview of different areas within an office space can also be found in Space & Layout Planning.
Tailoring illuminance levels to different office activities/areas can create a visually comfortable working environment and avoid occupant eye strain. In addition, light temperature, intensity and colour can have an impact on sleep patterns and mood.
Applying the following best practice principles can inform a lighting design supporting enhanced occupant health, wellbeing and productivity:
Daylight is ranked amongst the five most desired aspects employees seek in an ‘ideal’ workspace. However, almost half (47%) of all office workers are estimated to be working in an environment with no natural light. Research suggests a positive correlation between availability of daylight and enhanced employee performance, creativity and improved sleep patterns, activity and quality of life (Human Space, The Global Impact of Biophillic Design in the Workplace, Impact of Windows and Daylight Exposure on overall health and sleep quality of office workers).
Best practice measures for consideration when designing for daylight include:
Refer to the Layout & Space Planning for further consideration of spatial design in relation occupant comfort.
Preventing eye strain and headaches caused by glare and direct sunlight is important for occupants’ visual comfort. Best practice measures for a glare-free working environment include:
The use of low energy lamps and smart controls can reduce electricity consumption by 30% - 60% according to the Carbon Trust, as well as enhance occupant satisfaction and comfort.
The lighting of a fit-out is also a major contributor to a buildings EPC rating, and an important element to mitigating risks associated with Minimum Energy Efficiency Standards - See Owner Benefits.
Best practice measures which could be considered when specifying luminaires and controls include:
Appropriate zoning of lighting in the workspace can help to ensure efficient operation and good occupant comfort. Best practice principles when creating lighting control zones include:
At Deloitte’s offices in Amsterdam, ‘The Edge’, the building’s Ethernet-powered LED lighting system is integrated with 30,000 sensors to continuously measure occupancy, movement, lighting levels, humidity and temperature, allowing it to automatically adjust energy use. The new LED-lighting system has been co-developed with Philips. The Light over Ethernet (LoE) LED system is powered by Ethernet and 100% IP based. This makes the system (i.e. each luminaire individually) computer controllable, so that changes can be implemented quickly and easily without opening suspended ceilings. The luminaires are furthermore equipped with Philips’ ‘coded-light’ system allowing for a highly precise localisation via smartphone down to 20cm accuracy, much more precise than known WiFi or beacon systems.
The Philips LoE LED system was used in all office spaces to reduce the energy requirement by around 50% compared to conventional TL-5 Lighting. Via the LoE system daily building use can be monitored. This data is fed to facility managers via the BMS allowing managers to be alerted to lights that need replacing as well as provide insight on occupancy based trends and requirements. (Source: BREEAM)
Landsec's HQ fit-out at 100 Victoria Street, London included energy efficient LED circadian lighting used to match external light levels, with meeting rooms offering a variety of user-controlled lighting settings to suit different tasks. A bespoke LED light well adds high intensity light to the centre of the floorplate where natural light is at its lowest.
This integrated optimised lighting strategy, maximises access to natural light with clear sight lines, e.g. partitions removed; artiﬁcial lighting is programmed to be neither too bright nor too dull. The circadian lighting systems match the behaviour of natural light, changing to mimic the time of day.
The strategy was designed to deliver on Landsec’s sustainability commitments, including the Energy Star labelled equipment, including LED lighting and efficient building services to reduce operational energy use. Read more on the fit-out here.
Installed in an office building in Sacramento, California, 3M film allows natural daylight to enter at the top of the window and blind to be closed at the lower part of the window, reducing glare. Watch the video on daylight re-directing film from 3M here.
Please let us know if you have any suggestions of best practice examples in reducing glare, here.
At Kings Place, best practice targets to reduce electricity consumption for lighting included a reduction of 20% - 30% compared to previous energy consumption. In general office areas the aim is for an installed lighting power of less than 11 W/m2.
Hammerson’s Office at Kings Place achieved an installed lighting load of 5.28 W/m2, whilst all lighting controls, sensors, lamps and fittings used meet or exceed the Energy Technology List criteria.