The short answer
Yes, but not in the way marketing headlines suggest. You will often see precise-sounding claims that better lighting raises productivity by a fixed percentage. Those figures usually come from single studies, manufacturer-funded trials or results that are hard to trace, and they rarely transfer neatly to another building. What is well established is more practical: people need enough light, of the right quality and without glare, to see their task comfortably. When they do not get it, visual work becomes harder, discomfort rises and mistakes become more likely.
What UK guidance says
HSE: Lighting at work (HSG38)
The Health and Safety Executive’s guidance HSG38 Lighting at work is written for employers and safety staff. HSE describes it as covering the obvious effects of poor lighting, such as eyestrain, migraine and headaches, and the less obvious ones, including its established association with sick building syndrome, whose symptoms include headaches, lethargy, irritability and poor concentration. Poor lighting is also a safety issue: people need to see hazards, vehicles and steps clearly.
The legal baseline
Regulation 8 of the Workplace (Health, Safety and Welfare) Regulations 1992 requires suitable and sufficient lighting, by natural light as far as reasonably practicable. For screen users, the Health and Safety (Display Screen Equipment) Regulations 1992 add requirements on contrast, glare and reflections. These are minimum duties; they set the floor, not the target for a productive workplace. See our summary of workplace lighting regulations.
Design standards
BS EN 12464-1:2021 and the CIBSE SLL Code for Lighting and LG7 (offices) describe what good lighting looks like in practice: around 500 lx maintained on office task areas, reasonable uniformity, a UGR limit of 19 to control glare, good colour rendering and light on walls and ceilings so the room does not feel dim. These numbers are the industry’s best consensus on what lets people work comfortably.
How poor lighting affects work
Visual performance
Below a certain level of light and contrast, small detail takes longer to read and is more likely to be misread. The effect is strongest for fine or detailed tasks and for older workers, whose eyes generally need more light than younger colleagues’ for the same task.
Visual discomfort and fatigue
Glare from bright luminaires, reflections on screens, flicker and strong contrasts between a bright desk and a dark room all make the visual system work harder. Over a working day this shows up as tired eyes, headaches and difficulty concentrating, which are the effects HSE highlights.
Mood and the feel of a space
Spaces where walls and ceilings are dark tend to feel gloomy and enclosed, even when desk-level readings pass. Access to daylight and a view out are widely valued by occupants, which is one reason the Workplace Regulations prefer natural light where practicable.
Body clock (non-visual effects)
Light also influences circadian rhythms, alertness and sleep. This is an active area of research and lighting designers increasingly consider it, but the evidence does not yet support precise lux or colour-temperature prescriptions for productivity, and there is no UK legal requirement based on it. Be cautious of products sold with specific performance promises.
Safety
In warehouses, factories and car parks the cost of poor lighting is more direct: trips, collisions with vehicles and misread labels. HSG38 sets minimum values for areas where hazards must be seen, and BS EN 12464-1:2021 gives task-specific recommendations.
Signs your lighting may be affecting staff
- Repeated complaints of headaches or tired eyes, especially later in the day.
- Staff angling screens, taping over fittings, bringing in desk lamps or keeping blinds permanently shut.
- Some desks or areas visibly darker than others.
- Flickering lamps or a strobe-like effect near machinery.
- Errors in picking, inspection or reading tasks that cluster in particular areas.
- A recent LED retrofit or office reconfiguration with no lighting check afterwards.
Our article on why employees complain about lighting explains how to investigate each of these.
Practical improvements that make a difference
| Problem | Improvement |
|---|---|
| Low or patchy light at desks | Replace failed units, re-space or add luminaires, align desks with the lighting grid |
| Glare from fittings | Low-glare optics or diffusers, dim over-lit areas, re-position fittings |
| Screen reflections | Reorient screens, adjustable blinds, matte surfaces |
| Gloomy room | Raise wall and ceiling illuminance, lighter surface finishes |
| Flicker | Replace failing lamps or poor-quality LED drivers |
| Individual needs | Adjustable task lighting for detailed work or older staff |
Measure before you spend
The only reliable way to know whether lighting is limiting your workforce is to measure it against the benchmarks. A lux survey records task and surround illuminance and uniformity, notes glare sources and flicker, and compares the results with BS EN 12464-1:2021 and HSG38. That turns vague dissatisfaction into a short, prioritised list of fixes, and stops money being spent on upgrades that do not address the real problem. See light levels in the workplace for the targets by area.
Book a workplace lighting survey
Polarity Lux carries out independent lux surveys for offices, schools, warehouses and commercial premises across London and the South East, including Hertfordshire, Essex, Kent and Surrey. A single-floor office survey starts from £175 and a spot check of a problem area from £90. Book your survey and find out whether your lighting is helping or hindering your team.
Frequently asked questions
Does poor lighting reduce productivity?
Poor lighting makes visual tasks slower and more tiring and increases the chance of errors. HSE guidance HSG38 links it to eyestrain, headaches and sick building symptoms such as poor concentration.
Is there a reliable percentage for productivity gains from better lighting?
Not one that applies generally. Published figures vary widely between studies and buildings, so it is better to measure your own lighting against the standards and fix specific problems.
What lighting level is best for office work?
BS EN 12464-1:2021 recommends a maintained average of 500 lx for office reading, writing and screen work, with good uniformity and a UGR limit of 19.
Does natural light matter?
Yes. The Workplace Regulations 1992 require lighting to be by natural light so far as is reasonably practicable, and occupants generally value daylight and views, provided glare and screen reflections are controlled.