Why does laboratory lighting require different parameters than in an office?
Desk work differs from work at a laboratory workstation in terms of visual strain. In an office, the visual task is most often reading high-contrast text. In a laboratory, an analyst must read the scale on a burette or measuring cylinder, evaluate the shade of a solution during titration, or observe the formation of a precipitate. These tasks require higher visual resolution and accurate color rendering, because an incorrect reading translates directly into the analysis result. In titrimetric analyses, where the moment of indicator color change determines the accuracy of the entire determination, improper laboratory lighting is sometimes as significant a source of error as the inaccuracy of the measuring equipment itself.
Underexposure of the worktop does not always manifest itself immediately as an obvious problem; more often, it leads to a gradual accumulation of reading errors and eye fatigue, which accumulates over the shift. The employee unconsciously leans over the vessel or brings their eyes closer to the scale, which lengthens the analysis time and increases the risk of mistakes when recording the result. In the long run, this also affects the comfort and efficiency of the entire laboratory team.
The laboratory environment also places different demands on the luminaires themselves than office space. Reagent vapors, increased humidity, and frequent washing of work surfaces accelerate the wear of standard lighting fixtures. Therefore, lighting in laboratory spaces uses solutions with increased resistance to chemicals, featuring a housing and a diffuse cover that limits the settling of vapors on the light source.
Within a fume hood and other chemically resistant zones, the lighting must additionally take into account the limited space of the chamber and the presence of the exhaust system. The luminaire mounted above the chamber should provide even light over the entire work surface, without shadows cast by structural elements, while maintaining the tightness required in a zone subject to a continuous flow of exhaust air. In practice, this means using luminaires with housings resistant to acid and alkali vapors, mounted in a way that does not interfere with the ventilation operation.
An additional factor is working with photosensitive reagents, which decompose under the influence of excessive light exposure. The need to protect them affects the arrangement of cabinets and laboratory fume hoods in such a way that the storage zones for sensitive substances are out of direct reach of intense task lighting. This aspect should be considered at the layout design stage of the room, rather than only after finishing work is completed.
The PN-EN 12464-1 standard - what requirements does it set for workstations?
The PN-EN 12464-1 standard specifies lighting requirements for indoor workplaces, referring to specific workstations rather than the entire room treated as a single zone. The current edition is from 2022 and has expanded earlier requirements with additional criteria for visual comfort, including a more rigorous approach to glare and uniformity.
For laboratory workstations, the standard distinguishes between illuminance required for general tasks and for precise activities, simultaneously establishing minimum lighting uniformity and the permissible UGR glare rating. The visual task area must meet higher requirements than its immediate surroundings, with the illuminance difference between adjacent zones being limited so the eye doesn't have to constantly adapt. Compliance with the standard is confirmed by measurement after installation, which directly stems from occupational health and safety regulations.
In practice, this means that general work in a laboratory requires an illuminance of 500 lx with a uniformity of at least 0.60 and glare not exceeding a UGR value of 22. Precise tasks and color analyses already require 750-1000 lx, a minimum uniformity of 0.70, and lower permissible glare at a UGR level of 19. The immediate surroundings of the workstation can have slightly lower parameters - 300 lx with a uniformity of at least 0.40, maintaining the same glare limit as for general work.
Illuminance, color rendering, and uniformity - parameters to check
The lighting quality of a workstation is determined by three interrelated parameters: illuminance in lux, the color rendering index, and the uniformity of light distribution. When evaluating the color of a solution, in microscopy, and in diagnostics, a higher color rendering index is required than when working with documentation, because even a slight distortion of the shade leads to an incorrect interpretation of the result.
The recommended color temperature for laboratory workstations falls within the range of neutral to cool white light, which promotes the natural perception of shades. A drop in uniformity practically means darker areas on the worktop, where reading becomes less reliable. It is also essential to limit flicker and the stroboscopic effect; when working with centrifuges and stirrers, it can create the illusion that a rotating element has stopped.
In numbers, this means an illuminance of 500 lx and an Ra index at a minimum level of 80 for general tasks. For solution color evaluation and microscope work, the illuminance increases to 750-1000 lx, and the required color rendering index rises to at least 90.
Glare and reflections from the worktop - how to avoid them?
Direct glare comes from the luminaire itself visible in the field of view, while reflected glare occurs when light reflects off the work surface straight into the employee's eyes. The finish of the worktop plays a significant role here - matte surfaces diffuse light, while smooth and shiny ones reflect it almost without diffusion, intensifying the glare effect.
Recommended reflectance factors vary depending on the equipment piece: the ceiling should reflect the most light, walls and laboratory furniture moderately, and the floor and worktops the least, so as not to generate additional reflections. Reflections on the worktop surface make it particularly difficult to read the liquid level in a glass vessel, as the meniscus becomes hard to clearly locate.
Glare limitation is achieved through appropriate positioning of luminaires relative to the workstation, the use of diffusing covers, and directional reflectors. The finish of laboratory worktops is worth coordinating together with the lighting design at an early stage, rather than only after the luminaires are installed, when changing the light arrangement is much more difficult.
General vs. task lighting - when are both needed?
General ceiling lighting alone is rarely sufficient for precise tasks, because an employee leaning over the worktop blocks the light falling from above with their own body, creating a shadow exactly in the task area. The solution is to combine lower general illuminance with additional task lighting where tasks requiring higher precision are actually performed.
This approach avoids the costly illumination of the entire room to the highest required illuminance level, limiting it solely to workstations that genuinely need it. An added advantage is the ability to independently control the lighting of individual workstations, allowing conditions to be adapted to the specific type of work being performed.
General ceiling lighting usually provides 300-500 lx and works well in passageways and in the vicinity of workstations. Task lighting, mounted directly above the worktop, should instead provide 750-1000 lx where precise analyses are conducted, solution colors are evaluated, or microscope work is performed.
Lighting in fume hoods and above the worktop - what to foresee when designing?
Task lighting is planned along with the furniture, because only at this stage can it be seen how much space is left for the luminaire and the routing of the power supply. You need to coordinate the height of hanging cabinets, the exact mounting location of the luminaire above the worktop, the routing of cables in installation profiles, and their separation from water and gas installations.
The fume hood chamber requires even, shadow-free lighting, while maintaining the full tightness of the chamber and without disrupting the flow of exhaust air. Workstation switches should be within reach of the employee standing at the worktop. Renggli designs and manufactures laboratory furniture, worktops, as well as sinks and fume hoods – the luminaires themselves are supplied by specialized manufacturers, and the design's task is to foresee space and power for them beforehand.
High-risk laboratories - explosion-proof luminaires
In rooms and chambers where flammable liquid vapors can form, explosion-proof luminaires are required, selected according to the explosion hazard zone classification specified in the technological design. The permissible type of enclosure and its mounting method depend on the assigned zone.
In microbiological rooms, cleanrooms, and glass washing rooms, where surfaces are intensively disinfected, a high enclosure tightness of the luminaire (IP class) and materials resistant to acid vapors, such as stainless steel or tempered glass, are crucial.
September 17, 2026