The 2023 version of the LG7 guide is referencing the BS EN 12464-1:2021. The new guide is calling for minimising energy use where possible while maintaining a good visual environment for the occupants. Acknowledging the changes in how we use offices in the post covid world, the guide offers advice on lighting for home offices. 

Approach to designing office lighting.

Workplace lighting has to achieve more objectives than perhaps lighting in any other environment. Not only must it provide illumination on all surfaces to meet the workplace legislation, such as Workplace Regulations 1992, it needs to be comfortable, contribute to the interior design of the office as well as any brand aspirations. The guide also acknowledges the importance of lighting to ensure health and wellbeing of the occupants, and refers to WELL Standard as a benchmark for building design in the UK.

The guide stresses the importance of well designed lighting. Visual comfort of the users and its long term impact on the occupants are not to be compromised in an effort to reduce energy consumption. Well designed lighting installation and controls could have a greater influence on energy consumption.
The design may either be for a known user or a speculative developer. It may be a new build or a refurbishment. In the design brief for a known user, the needs of the user in relation to the physical constraints should be considered. Designer should understand how the office will be used. Once this is understood, the the correct task illuminance should be selected. In addition to task lighting, feature lighting needs to be considered. The need for emergency lighting has to be assessed ( for more information, check SLL Lighting Guide 12: Emergency Lighting 2022).

For speculative developments, the use of the space is unknown and it is a common practice to provide a ‘blanket coverage’ It recognises that working with known occupiers and understanding the type interior décor for the surface reflectance is easier in terms of preliminary lighting calculations.
Control of lighting is an equally important part of the design process and in some complex building, it may be necessary to bring a specialist designer to the team.

Office types.

Offices are perhaps the most varied of commercial spaces, ranging from small studios to large open-plan floor plates with a full range of secondary office spaces. The guide looks into different types of luminaires suitable for each type of office space typical for the UK market. It gives considerations to lighting in self-contained office buildings with spaces such as meeting rooms, impressive reception areas and lobbies, offices in mixed use developments, shared offices or offices in listed buildings. A more general lighting approach is needed for speculative developments. There is a new chapter dedicated to Home office lighting. 

More detail.

Illuminance Levels

Daylight and Electric Lighting

Energy Use

Emergency Lighting