A workplace lighting requirement is set by examining what a person must see, how accurately it must be seen and under what conditions the work is performed. The room name provides context, but the visual task determines the lighting needed at the point where the work is carried out.
A visual task is the part of an activity that depends on seeing detail, position, shape, movement, surface condition, colour or information. Reading a document, aligning components, checking a weld, identifying damage, monitoring a display and selecting goods from a shelf are different tasks even when they take place in the same room. Their lighting requirements cannot therefore be established reliably from the room type alone.
The task should be defined narrowly enough to identify what must be visible. In an office, it may involve text on paper, a keyboard, a screen or handwritten notes. In a workshop, it may involve a cutting line, a tool edge, a moving part or a finished surface. In a warehouse, it may involve a product label, pallet location, vehicle route or the condition of stored goods.
Task-based assessment also separates general lighting from local task lighting. General lighting supports movement, orientation and ordinary activity, while local lighting can provide additional illumination where a particular operation needs greater visual support. The relevant question is whether the task can be performed accurately, safely and comfortably during normal work.
The size of the critical detail is a principal driver. Large lettering, broad outlines and substantial components are easier to distinguish than fine print, small graduations, hairline cracks or subtle surface defects. As the detail becomes smaller, the task generally demands more carefully controlled illumination at the working plane.
Contrast is equally important. A dark mark on a pale surface is easier to detect than a feature differing only slightly from its background. Dust on a similarly coloured product, a faint scratch on polished metal or a translucent defect in clear material may remain difficult to see even where measured illuminance is substantial. The issue is not only how much light reaches the task, but whether the critical feature stands out.
Speed changes the demand because a person has less time to locate and interpret information. A stationary component examined at leisure differs from an item moving through production. Duration also matters: conditions adequate for a brief check may become tiring during continuous inspection, detailed assembly or prolonged document work. Small detail, weak contrast, rapid presentation and long duration create a particularly demanding combination.
The consequences of error should also be considered. A task connected with product release, machine set-up, electrical isolation or defect detection may justify a higher requirement than one where an occasional visual error has little effect.
The task area is the surface or volume within which the critical visual work takes place. It may be a desk, inspection bench, control panel, machine bed, drawing board or conveyor section. Its position, height and orientation should be identified before the requirement is selected, because a measurement elsewhere may not describe the light available to the task.
The immediate surrounding area is the zone directly around the task. It supports visual adaptation when attention moves between the critical detail and nearby tools, materials or information. The background is the wider visual field beyond that zone. A task-based scheme therefore follows a hierarchy: the task receives the lighting needed for the work, the nearby area supports changes of attention, and the wider background prevents the task from appearing visually isolated.
This hierarchy matters where local lighting is used. A powerful lamp aimed only at a small workpiece may produce an acceptable reading on that item while leaving adjacent controls, tools and reference materials difficult to see. Conversely, increasing lighting throughout a room to satisfy one small task may create unnecessary brightness elsewhere. Defining the task area allows the response to match the actual visual demand.
The assessment should reflect the real operating arrangement. Movable benches, adjustable equipment, shared workstations and changing production layouts can shift the task away from its assumed position, so a survey should record where the work is performed in practice.
A room-average illuminance value combines readings from many locations into one figure. It can describe the space broadly, but it does not establish whether the critical task is adequately lit. High readings beneath luminaires or near windows can raise the average while the task remains in a less favourable position.
The average also hides different activities within the same room. An office may contain screen work, document review, drawing examination and storage retrieval. A workshop may contain circulation, machine operation, bench assembly and inspection. Treating the room as one visual activity can produce a target that is excessive for some areas and insufficient for others.
Task-based interpretation starts with the work and asks whether the measurement locations represent it. Readings should be taken on the relevant plane and at the actual task position, with the normal furniture, machinery and operating arrangement in place where practicable. The result should be compared with the requirement selected for that task, not merely with the arithmetic average for the room.
A task requirement may need to be raised when the detail is unusually small, contrast is weak, the work is rapid, duration is prolonged or the consequences of error are significant. Adjustment may also be needed where the task is viewed through a window, protective screen, visor or enclosure that reduces the amount or quality of light reaching the eye.
The requirement may be lower where the task is large, clear, slow and brief, provided that any applicable mandatory minimum is still met. A reduction should follow from the visual demand and the accepted structure of the reference being used, rather than being treated as a general cost-saving measure.
Where work is shared by people with different visual capabilities, the scheme should support the reasonably foreseeable workforce rather than an assumed ideal observer. Age-related visual change is addressed on the separate page about ageing eyes and lighting. Persistent headaches, eye discomfort or visual disturbance should be referred to occupational health rather than interpreted from a lighting reading alone.
The design basis should also distinguish initial output from the condition expected during use. Lamps, luminaires and room surfaces change over time, so the requirement is normally considered as a maintained condition; maintenance and depreciation are addressed separately.
In the Emirate of Abu Dhabi workplace lighting is a mandatory matter. ADOSH-SF Code of Practice 8.0, General Workplace Amenities, Version 4.0, effective 15 July 2024, applies to all employers within the Emirate of Abu Dhabi. Section 3.8 sets minimum illumination intensities of 30 foot-candles for offices, general work areas, first aid stations and medical treatment centres; 10 foot-candles for bathrooms, dining halls, mechanical and electrical equipment rooms, carpenter shops and general construction plant and shops; and 5 foot-candles for access ways, storage areas, warehouses, refuelling, maintenance areas and loading platforms, and for general construction sites, concrete placement, excavation, tunnels, shafts and underground work areas. One foot-candle is approximately 10.764 lux, placing those minima at roughly 323, 108 and 54 lux.
These are category minima and do not remove the need to examine a more demanding task within the category. A fine inspection task in a general work area should not be assessed solely by asking whether the broad minimum has been reached.
ADPHC's Technical Guideline Ergonomics in an Office Environment, Version 4.0, July 2024, recommends between 30 and 50 foot-candles, or 300 to 500 lux, for office and screen work. ADPHC classifies Technical Guidelines as non-mandatory. At federal level, MOHRE Administrative Decision No. 19 of 2023 includes Article 4(c) on lighting, requiring employers to maintain adequate lighting, avoid dazzle and glare in confined spaces, provide adequate lighting for precision operations in accordance with its attached Table (1), and ensure emergency lighting is available if the primary system fails.
EN 12464-1:2021 and ISO/CIE 8995-1:2025 provide an international task-based structure for selecting and applying lighting criteria. They are consensus standards widely used in the Gulf and often specified contractually, but they are not statutory in the UAE unless an instrument adopts them, and no UAE instrument identified adopts them. Their role is to relate the visual task, task area and surrounding visual environment without replacing applicable legal duties.
In the Emirate of Abu Dhabi, workplace lighting is a mandatory matter. The Abu Dhabi Public Health Centre states that Codes of Practice under the ADOSH-SF framework are mandatory to all entities regardless of risk classification, and ADOSH-SF Code of Practice 8.0, General Workplace Amenities, Version 4.0, effective 15 July 2024, applies to all employers within the Emirate of Abu Dhabi. Its Section 3.8 sets minimum illumination intensities of 30, 10 and 5 foot-candles according to area type, which the Code itself converts at approximately 10.764 lux to the foot-candle. ADPHC's Technical Guideline on ergonomics in an office environment adds recommendations for office and screen work and is classified as non-mandatory. At federal level, MOHRE Administrative Decision No. 19 of 2023, Article 4(c), places lighting duties on employers within MOHRE's jurisdiction, including a requirement for emergency lighting when the primary system fails. EN 12464-1 and ISO/CIE 8995-1 are consensus standards: widely used and often specified contractually, but not statutory in the UAE unless an instrument adopts them. A requirement binding only in the Emirate of Abu Dhabi is not UAE law and must not be described as such.
ADOSH-SF Code of Practice 8.0 — General Workplace Amenities, V4.0 (15 July 2024), Section 3.8; MOHRE Administrative Decision No. 19 of 2023, Article 4(c)
No. A room label describes the setting, while the task requirement is based on what must be seen and how demanding that act of seeing is. Several task requirements can exist within one room.
Yes. High readings elsewhere can increase the average even when the critical task position receives less suitable illumination. The task position must therefore be assessed directly.
No. Some tasks can be supported by the general lighting system, while others benefit from local lighting. The arrangement depends on task position, detail, contrast, duration and the surrounding visual environment.
It can be lower where the task is large, clear, slow and brief, but it must remain consistent with the reference framework and must not fall below an applicable mandatory minimum.
No. They establish mandatory minima for the listed workplace categories within the Emirate of Abu Dhabi. A task with greater visual demand may require a more demanding lighting criterion.
The location, height and orientation of the task determine where the relevant measurement should be taken. A reading from another part of the room may not represent the conditions experienced during the work.