Lighting risks in laboratories
Laboratories combine office-type screen work with precise visual tasks and hazardous materials. The problems we see most often are:
- Bench shadowing from shelving, reagent racks and the analyst's own body when luminaires run parallel to the bench rather than over its front edge.
- Dim fume cupboards and safety cabinets, where internal lights have failed or sashes and screens cut light from the room.
- Colour judgement errors in titrations, colorimetric tests and sample appearance checks under poor colour rendering.
- Glare and reflections on glassware, screens and instrument displays.
- Specialist rooms, such as darkrooms, microscopy suites and photosensitive work areas, which need deliberately reduced or filtered light but still require safe movement and escape.
Standards and lab lux levels
The legal duty is regulation 8 of the Workplace (Health, Safety and Welfare) Regulations 1992, with HSE guidance HSG38 Lighting at work. BS EN 12464-1:2021 gives the recognised design values, including entries for laboratories in industrial, educational and healthcare settings.
| Area or task | Maintained illuminance (BS EN 12464-1:2021) |
|---|---|
| Laboratories and precision measuring rooms | 500 lx |
| Teaching laboratories and practical rooms | 500 lx |
| Colour inspection | 1000 lx |
| Offices and write-up areas | 500 lx |
| Stores and stock rooms | 100 lx |
| Corridors and circulation | 100 lx |
Laboratory benches typically also need good uniformity across the bench depth and colour rendering of Ra 80 or better, with higher colour rendering for colour-critical work. Microscopy and screen-heavy analytical rooms benefit from controllable, lower ambient light with good task lighting, which is where a simple average reading can mislead. Use our required lux lookup for other room types.
Who asks about laboratory lighting
HSE
HSE enforces health and safety in most laboratories. Where hazardous substances are handled, poor lighting increases the risk of spills, misreading labels and errors during COSHH-controlled procedures.
Accreditation and regulatory auditors
Testing and calibration laboratories working to ISO/IEC 17025, and medical laboratories working to ISO 15189, must show that facilities and environmental conditions are suitable for the work and do not compromise results. Pharmaceutical QC labs are inspected by the MHRA under GMP, and GLP facilities by the MHRA's GLP monitoring authority. A dated lux survey is simple supporting evidence for any of these.
Universities, hospitals and estates teams
Estates teams increasingly measure lighting after refurbishments and as part of planned maintenance. Hospital pathology labs fall within healthcare estates guidance, including SLL LG2.
What we measure in a laboratory survey
- Bench-top illuminance along the front working edge and across the bench depth, giving average and uniformity per bench run.
- Illuminance inside fume cupboards and microbiological safety cabinets at the working surface, with sashes at the normal working height.
- Readings at instrument stations, balances and colour-critical positions.
- Write-up areas, offices, stores and corridors.
- Escape route lighting from labs, including from darkrooms and restricted-light rooms, against BS 5266-1:2025 and BS EN 1838:2024.
- Luminaire condition and any failed lamps in cabinets and cupboards.
We follow your local rules, including PPE, containment level restrictions and permits, and can work around experiments in progress. Readings are referenced to room and bench numbers so you can file them with facility records.
Teaching and research labs
University and college teaching labs are used by large groups, often for short practical sessions, and by students who are less familiar with the hazards. Even lighting across every bench position matters more than a high average, because the students at the end of each bench run are usually the ones in the darkest spots. Research labs, by contrast, tend to accumulate equipment, shelving and screens over time, gradually blocking light that the original design relied on. Both benefit from periodic measurement rather than a one-off check at handover.
Refurbishments and LED upgrades
Laboratory refits often change bench layouts and add new shelving or extraction, any of which can create shadow on the working surface. Checking after installation confirms that benches still achieve 500 lux. Our guide to LED upgrades and compliance covers what to look for.
Book a laboratory lighting survey
We survey commercial, university and healthcare laboratories across London and the South East, including the Cambridge and Hertfordshire science clusters. University labs are covered by our university lighting surveys, hospital labs by our hospital surveys, and commercial labs by our commercial lux survey. Book a survey and we will confirm the scope and price beforehand.
Frequently asked questions
What lux level is required in a laboratory?
BS EN 12464-1:2021 recommends 500 lux maintained illuminance for laboratories, with 1000 lux for colour inspection tasks. Uniformity across the bench and good colour rendering are also important.
Do you measure lighting inside fume cupboards?
Yes. We take readings at the working surface inside fume cupboards and safety cabinets with the sash at its normal working height, as internal lighting failures are common and easily missed.
Will a lux survey help with ISO/IEC 17025 or ISO 15189 audits?
Both standards require suitable facilities and environmental conditions. A dated lux survey referenced to rooms and benches is straightforward evidence that lighting has been assessed, although it is your own accreditation that auditors are assessing.