A lighting survey should be planned around the decision it is expected to support. Scope, timing and site conditions matter because readings can change with daylight, occupancy, stock, maintenance and the way the workplace is operating.
The first question is why the survey is being carried out. Its purpose may be to investigate employee concerns, check conditions after refurbishment, establish a baseline, examine a change of use, review a particular task or assess whether an existing installation remains suitable. Each purpose creates a different boundary for the work.
A broad workplace review may include representative spaces, while a complaint investigation may concentrate on one workstation, production line or time of day. A handover survey may capture a completed installation before occupation, whereas an operational assessment should reflect ordinary use. The scope should state whether the work concerns general lighting, selected tasks, specific complaints or a defined change.
The planning stage should identify the basis against which the results will later be considered. This may be a legal duty, an Abu Dhabi Code of Practice, a non-mandatory technical guideline, a contract specification or an international consensus standard. The reference should be named accurately without turning the plan into an interpretation of the eventual findings.
The areas included should be agreed before attendance. Room names may be insufficient where several activities occur in one space. A warehouse may contain pedestrian routes, picking faces, packing stations, loading areas and maintenance points, each used differently and under different lighting conditions.
The normal task should be described in practical terms, including where the worker looks, whether the work is seated or standing, whether small detail or low contrast is involved, whether the task moves and whether local lighting is normally used. Permanently occupied work areas should be distinguished from occasional access zones, storage spaces and maintenance locations.
Furniture, machinery, partitions, blinds, racking and stock can alter the amount and distribution of light. Planning should establish whether these elements will be in their normal positions. Where different shifts use the same area differently, the intended operating state should also be defined so that the observed condition matches the purpose.
Daylight can contribute substantially near windows, rooflights and open façades, but it varies with time, cloud, solar position, blinds and external shading. The plan should state whether daylight is included as part of normal use or excluded so that electric lighting can be considered separately.
Where daylight is included, one visit records only the conditions present at that time. More than one attendance or a deliberately selected period may be needed where the concern relates to recurring morning reflection, afternoon sun penetration or seasonal change.
A night-time survey removes most daylight influence and may be needed for workplaces used after dark, external areas, loading zones or facilities with different night settings. The site should confirm that normal night-time controls, occupancy and operating arrangements will be available.
Blinds, curtains, electrochromic glazing and automatic daylight controls should remain in the condition being assessed. Where controls vary output in response to daylight or occupancy, their behaviour should be understood and the intended mode maintained long enough to obtain representative readings.
Some light sources do not reach stable output immediately after switch-on. The installation should be allowed an appropriate run-up and stabilisation period before readings begin. The period depends on the source, control gear and recent operating history.
Lighting controls should be set to the normal or agreed survey mode. Dimming levels, occupancy sensors, schedules, local switches and automated scenes can all affect the result. Any temporary override should be recorded because it may differ from ordinary operation.
Supply voltage may influence light output where the installation, driver or control system responds to voltage variation. Known instability, generator operation or electrical faults should therefore be documented. A survey undertaken during an abnormal supply condition may not represent routine performance.
Failed lamps, disabled controls and temporary lighting should not automatically be corrected before the visit. If the purpose is to record conditions as found, the defects form part of the evidence. If the purpose is to assess the intended installation after maintenance, agreed work should be completed first.
Lighting performance changes as an installation ages. Lamps and LED modules may lose output, diffusers and reflectors may accumulate dirt, and room surfaces may become darker. A survey of an occupied workplace usually records maintained conditions rather than the initial performance of a new installation.
Readings taken immediately after installation, replacement or cleaning may be higher than those obtained later in normal service. A commissioning check and an operational survey can therefore produce different results without either set being inherently wrong.
Planning should identify recent cleaning, relamping, luminaire replacement or refurbishment. Lamp age and operating hours may not always be available, but known information should be recorded. Dirt, failed components, discoloured surfaces and blocked fittings may help explain the condition found.
The room state also matters. Freshly painted surfaces may reflect more light, while high stock levels may create shadowed zones. The survey should capture normal use rather than an artificially improved or unusually degraded state unless that condition is the subject of the investigation.
Safe access should be considered before the visit, particularly above machinery, on mezzanines, beside traffic routes or in external areas. Any need for work at height, roof access, mobile platforms, isolation, permits or escorts should be identified in advance.
Site rules, induction, personal protective equipment, restricted zones and operational hazards should be confirmed. Assessment during normal production should not interfere with moving equipment, vehicle routes or process safety. Where a task cannot be approached safely while operating, an alternative arrangement should be agreed.
A facilities representative may be needed to explain controls, identify circuits, operate blinds or provide access. A supervisor or task operator may show how work is performed and where difficulty occurs. An electrical or maintenance representative may clarify faults, controls or recent repairs.
Occupants should be present where their position, equipment or behaviour affects the condition being assessed. The record should identify who attended, who supplied operational information and whether an expected representative was unavailable.
The plan should specify which contextual details must be recorded, including date, time, weather, daylight, blind position, lighting mode, occupancy, machinery status, stock arrangement, furniture layout, recent maintenance and temporary conditions.
Photographs, marked plans and room references can preserve the relationship between the readings and the workplace configuration. Any restriction on photography should be resolved before attendance.
Departures from the plan should be recorded as they occur. A room may be inaccessible, a process shut down, a lighting scene unavailable or an area rearranged. Such changes do not automatically invalidate the survey, but they alter what the evidence represents.
A defensible plan allows another competent person to understand the intended scope and the conditions under which the work was completed. Measurement grids belong on the illuminance measurement page, while meter performance and calibration belong on the instruments page.
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)
The timing depends on the purpose. Daytime assessment may be appropriate where daylight forms part of normal conditions, while a night-time survey may be needed to isolate electric lighting or assess workplaces used after dark.
They should be present where they form part of the normal condition. Furniture, equipment, stock and people can block or reflect light, so an empty space may not represent the occupied workplace.
Some sources and control systems change output after switch-on. Stabilisation reduces the risk that readings represent temporary run-up behaviour rather than normal performance.
Yes. Cleaning luminaires, diffusers and room surfaces may increase light reaching the workplace. Whether cleaning should occur first depends on whether the purpose is to assess conditions as found or performance after maintenance.
Attendance may include a facilities representative, supervisor, task operator, maintenance person or site escort. The necessary attendees are those who can provide access, operate controls and explain normal working conditions.
The change should be recorded and its effect considered. The survey may continue where the remaining conditions still answer the intended question, or the affected area may need assessment at another suitable time.