In healthcare, light is a complex factor that goes far beyond mere functionality. It influences physiological processes, neurological functions, and psychological states, and is an integral part of architecturally and technically well-thought-out planning. The targeted use of light contributes to accelerating healing processes, increasing well-being, and optimising medical procedures.
Biologically effective lighting systems, particularly the combination of daylight and dynamically controlled artificial light, activate central endocrine rhythms. The body's own production of melatonin and cortisol is modulated, thereby stabilising the circadian rhythm. This demonstrably leads to improved sleep-wake cycles, increased emotional stability, and enhanced cognitive performance – parameters that directly influence patient recovery and staff work performance.
Patient orientation: Orientation is provided, stress is reduced, and autonomy is promoted through adaptive lighting scenarios, individual light control, and consideration of visual needs.
Work support For diagnostic and operative activities, high illuminance levels (sometimes exceeding 1,000 lux), excellent colour rendering (Ra ≥ 90) and glare-free light guidance are required to ensure precision and safety.
Operational efficiencyEnergy-efficient light sources with a long service life, combined with intelligent control systems (e.g. DALI, KNX), sustainably reduce operating costs and maintenance effort.
Only through an integrated consideration of these factors can a lighting concept be created that holistically combines medical requirements, architectural design, and economic aspects, thereby creating sustainable added value in healthcare.
Light as a control instrument for physiological rhythms
Modern healthcare facilities are increasingly evolving from purely functional spaces to sensitively designed environments that specifically support regeneration and psychological well-being. Lighting plays a key role in this. It not only creates atmosphere but actively reduces anxiety and builds trust – especially in highly stressful situations such as before diagnostic examinations, surgical procedures, or in emergency areas.
Biologically optimised lighting design
An effective lighting concept is consistently aligned with natural daylight cycles and integrates specific biologically active parameters:
Light therapy – originally used in the treatment of seasonal affective disorder – is increasingly being incorporated into architectural concepts. Targeted use of coloured light enhances its emotional impact: yellow is calming, green conveys security, and violet is stimulating.
Coloured light applications for emotional support
The integration of colour light therapy approaches broadens the effect of biologically-effective light. Originally established in the treatment of seasonal affective disorder, specifically deployed colour light scenarios are now architecturally integrated to positively influence emotional states:
Intelligent Control Based on Context and Need
Modern lighting control systems allow for the easy activation of predefined lighting scenarios, which can be flexibly adapted to the time of day, room function, and individual patient needs. For example, in diagnostic areas such as MRI or CT, calming lighting moods can be created, which are proven to reduce stress and increase the success rate of examinations by making cancellations less likely.
In the patient's room, the lighting combines two essential requirements: a functional basic supply that supports all nursing and medical activities, as well as a homely atmosphere that promotes psychological well-being and self-determination.
The base is an indirect lighting system with at least 100 lux in a warm white colour temperature (under 3,000 Kelvin). This reduces glare, visually expands the space, and creates a pleasant, calming environment that enhances patients' subjective well-being.
Standard DIN 5035-3 places particular emphasis on glare limits: luminaires within the patient’s direct field of vision must not exceed a luminance of 1,000 candelas per square metre. Ceilings, which act as reflective surfaces, are limited to 500 candelas per square metre to ensure a comfortable lighting environment.
Individual customisation includes a reading light at each bed, which ensures at least 300 lux at reading level and can be controlled separately so as not to disturb the sleep of other occupants. Night orientation lights with around 5 lux at a height of approx. 85 cm enable nursing staff to handle things safely in the room without disturbing patients. Broad-beam LED lights below the lying surfaces are preferably used.
These are complemented by examination lights providing at least 300 lux for routine nursing tasks and at least 1,000 lux for medical diagnostic procedures and emergencies. The DIN EN 12464-1 standard requires a colour rendering index (Ra) of over 90 and glare-free light sources.
A modern lighting management system allows all lighting groups to be switched individually and complex lighting scenarios to be recalled as needed – via wall switch, remote control, or central control. This supports the daily rhythms of patients and flexibly adapts to emergency situations.
Thus, the lighting in the patient room combines optimal functionality, safety, and security – a crucial factor for the recovery process and the satisfaction of everyone involved.
Modern medical supply units (MSUs) are far more than just technical components – they enable precise lighting planning in the patient's immediate vicinity. As wall- or ceiling-mounted modules, they integrate supply technology, lighting, and design in a confined space – functionally, safely, and with an effective aesthetic.
The lighting components of an MVE take on different roles: from uniform general lighting and orientation-providing accents to precise examination lights. 300 lux are sufficient for nursing tasks, while a minimum of 1,000 lux are required for medical examinations. Night and orientation lights with approximately 5 lux enable nursing activities without disturbing nighttime rest.
In this context, lights must be glare-free, low maintenance, and compliant with standards. Integration into digital control systems (e.g. DALI) allows for intuitive operation – directly at the module or via a touch panel. Design elements such as colour-accentuated panels or flush integration enhance the quality of stay and allow the technology to recede into the background.
MVE glazing systems compliant with DIN EN ISO 11197 combine regulatory safety with architectural flexibility – a future-proof solution for new builds and refurbishments.
Examination and treatment rooms are subject to high lighting requirements, which must ensure both medical precision and a calming atmosphere. Bright, friendly, and warm lighting promotes patient confidence and has a calming effect, while a clearly structured setup supports the overall impression.
For general room lighting, LEDs or fluorescent lamps with direct and indirect light distribution are suitable.
The DIN 5035-3 specifies a minimum illuminance of 300 to 500 lux for these rooms, depending on the department. Indirect lighting is generally perceived as pleasant by patients, as it makes the room appear more spacious. At the same time, the direct lighting around the examination couch must be designed so that patients are not dazzled, particularly when looking up towards the ceiling.
Examination lights, whether fixed or mobile, must provide an illuminance of at least 1,000 lux. High colour rendition with Ra values of at least 90 and colour temperatures between 3,000 and 6,700 Kelvin are also essential. LEDs offer advantages here due to high light quality, low heat development, and energy efficiency.
Examination rooms serve several functions: Alongside patient examinations, discussions, screen work, and office-like tasks take place here. Therefore, general lighting must be planned to avoid glare or reflections on monitors. For imaging procedures such as ultrasound, dimmable lighting systems are also recommended to create optimal visibility with variable brightness.
In treatment and therapy rooms, dimmable, indirect general lighting creates a pleasant atmosphere, complemented by powerful examination lights. Coloured light, controllable via RGB, can be used to promote relaxation and provide emotional support.
Modern lighting control systems allow for the flexible selection of predefined lighting scenarios via displays, computers, or mobile devices, thus supporting versatile room usage.
Overall, sophisticated, high-quality lighting design contributes decisively to medical success and well-being, while remaining flexibly adaptable to changing requirements.
Precise vision is the foundation of medical work. Whether in wound care, diagnosis via ultrasound, or when dealing with digital displays – the light must be optimally matched to the specific visual task. Particularly important are:
Mobile or integrated lights in supply units ensure short distances and ergonomic positioning. Combined with indirect general lighting, this creates visually calm rooms that promote concentration and efficiency.
Particular attention should be paid to night shifts: lighting systems with circadian adaptation can maintain staff performance and counteract health stresses. This is where light colours with an increased blue component in the early morning hours and dimmed, warm-toned light gradients at night are used – supported by controllable lighting technology.
Operating theatres are among the most complex functional areas in healthcare construction and place exceptionally high demands on lighting design. The lighting must create optimal visibility for the surgical team, meet the highest hygienic standards, and at the same time minimise the strain on staff and patients.
The focus is on differentiated lighting in multiple zones:
The general lighting must be glare-free, uniform, and cast minimal shadows. It should ideally complement the focused surgical lighting in terms of colour temperature and colour rendering – differentiation in light quality between zones is to be avoided.
Modern operating theatre lights have extensive technical features: full Cardan suspension, stepless height adjustment, rotatability, and a focusable light field. Hygienically, they are equipped with IP protection classes from IP54 to IP65, smooth surfaces, sealed housings, and optimised cleaning edges. Minimal heat radiation is essential to protect patients and staff from overheating.
LED lighting systems with adaptive colour modes are becoming increasingly common, allowing for special lighting scenarios for different procedures, e.g. dimmed, cool light for minimally invasive operations.
The lighting in the operating theatre is implemented today as part of a comprehensive, networked overall technical system. Controls via touch panels, room control units, and DALI or KNX interfaces allow for intuitive operation and precise adjustment of lighting scenarios – from preparation and the start of surgery to cleaning.
Standards such as DIN EN 60601-2-41 (Medical lighting), DIN EN 1838 (Emergency lighting) and DIN EN 12464-1 (Lighting of workplaces) set out mandatory requirements and framework conditions.
This comprehensive technical and design planning ensures that lighting in the operating theatre is not only functional but also safe, ergonomic, and efficient – a fundamental requirement for successful surgical procedures.
Not only in the operating theatres themselves, but also in adjoining areas such as waiting rooms, preparation rooms and recovery rooms, lighting plays a crucial role in patient well-being. These spaces are places of high emotional stress, where light, through targeted design, can reduce anxiety and foster trust.
Dynamic light gradients and colour control
Indirect light sources with a warm white light colour (2,700 to 3,300 Kelvin) promote a gentle transition from anaesthesia and support the stabilisation of the circadian rhythm through biologically effective light.
An important note for these sensitive areas: Intense light colours on walls or ceilings, especially in close proximity to operating areas, should be avoided as they can negatively affect colour reproduction in medical work areas.
Lighting design in the operating theatre is far more than just technical equipment – it is an integral part of medical safety, architectural design, and psychological guidance, and part of a complex, integrated system. It is closely networked with other central facilities such as media supply and video surveillance and is operated via central control systems.
Interfaces such as DALI and KNX enable the precise control of predefined lighting scenarios. The integration of lighting into digital operating room supply systems (ceiling supply units, OR bridges) allows for flexible positioning and ease of operation, combined with the hygienic, thermal, and functional requirements of modern OR infrastructure.
System integration and standards
Only when the operating theatre, room environment and adjacent functional areas are considered in a differentiated yet systemic way can a functional lighting concept for peak performance in healthcare construction be achieved.
Economic and flexible building solutions in the healthcare sector are gaining importance with modular construction and hybrid system solutions, such as light in modular hospital construction.
Typical solutions include pre-fabricated ceiling panels with integrated lighting technology, light strips and downlights with DALI connectivity, as well as plug-and-play concepts for medical supply units and operating theatre lights. Pre-defined interfaces ensure seamless integration into overarching lighting management systems.
This systematic approach not only enables shorter construction times but also a high level of standardisation and quality assurance – especially in the sensitive healthcare environment.
Modular lighting systems offer numerous advantages:
The importance of early, integrated planning is particularly evident in modular construction: lighting technology, energy supply, control systems, and spatial design must be understood as a single unit.
Digital planning processes (BIM) enable precise coordination of lighting, connection points, and control components right from the design stage. This ensures that both functional requirements and design intentions can be reliably implemented.
Systemic lighting design enhances the future-proofing of healthcare buildings and ensures an optimal user experience with high cost-effectiveness.
Light quality meets energy efficiency – economic viability as a planning factor
While modern lighting systems in the operating theatre ensure maximum precision and safety, they only unfold their full potential in conjunction with sustainable energy and operational concepts.
Hospitals are among the most energy-intensive types of buildings, with lighting accounting for up to 22% of total electricity consumption. Against this backdrop, modernising lighting systems offers significant potential for savings.
Refurbishment concepts begin with a precise inventory: types of lights, service lives, control systems, and daylight factors are analysed. Measures range from LED-Retrofiabout Presence and daylight sensing until complete system overhaulg with DALI connectivity.
Key basis: DIN V 18599, the energy assessment of lighting, as a prerequisite for eligibility for funding and approval processes.
Modern LEDs with high luminous efficacy and optimised colour rendering (e.g. ≥ 3,300 K warm white) enable energy savings of up to 80% – whilst also reducing maintenance costs and improving light quality.
Furthermore, architectural measures such as targeted daylight control and reflective surfaces have a positive effect by reducing the need for artificial light. Automated lighting zones in traffic areas and ancillary rooms, controlled by presence detectors, further contribute to increased efficiency.
Through this integrated lighting design, lighting becomes a strategic factor for sustainable hospital operation, CO₂ reduction, and long-term decreasing operating costs.
