Acceptance & QC

The handover pack decides what the building costs for the next fifteen years

The eleven documents a lighting installation should be handed over with, why the missing ones are always the same ones, what a witnessed acceptance test should actually witness, and how to tie the pack to a payment milestone so that it exists.

Written by Yilian Zhikong Technology (Shenzhen) Co., Ltd. · Last reviewed August 2026

Ask a facilities manager what went wrong with the lighting and the answer is rarely about light. It is that nobody knows what the fittings are, the control system was configured by a contractor who has moved on, the emergency log book starts eighteen months after practical completion, and the spares that were bought are in a cupboard somebody cleared out. The installation is fine. The information about it is gone, and the cost of that lands on every subsequent decision.

Why the same documents are always the missing ones

The pattern is consistent and it is structural rather than careless. The documents that go missing are the ones produced by somebody other than the party being paid at practical completion — the commissioning engineer's configuration file, the emergency photometric verification, the batch reference for colour matching. The installing contractor's own documents are usually present, because those are the ones tied to their payment.

Which suggests the remedy, and it is contractual rather than technical: name the deliverables, and tie them to money. Everything below is trivially cheap to produce at the time and expensive or impossible to reconstruct afterwards.

The eleven documents

1. As-installed drawings showing luminaire types and positions against the final floor plan — not the tender plan. Refurbishments move partitions, and a drawing that predates that move is worse than none because it will be trusted.
2. The luminaire schedule with full ordering codes, including CCT, CRI, optic, driver and finish variants. "Type A downlight" identifies nothing two years later, and a replacement ordered from it will not match.
3. Photometric data files for each type as installed, so that any future alteration can be calculated rather than guessed.
4. Test reports — LM-79 for the supplied ordering codes, with the fields listed in reading a photometric test report.
5. The lighting calculation as built, with its grid, reflectances and maintenance factor visible. This is the document any future dispute about performance will be assessed against, and a calculation whose assumptions are invisible cannot serve that purpose — the reasoning is in uniformity and the compliant average.
6. Handover illuminance readings on the same grid as the calculation, with meter, class, calibration date and daylight condition recorded. These become the initial values that any performance warranty claim depends on.
7. Control system documentation: addressing schedule, group and scene tables, topology drawing, bus loading calculation, and an exported configuration backup with the tool and version named. The full list and the reason for each is in DALI-2 and D4i commissioning.
8. Emergency lighting completion certificates, the scheme drawing against the current plan, the photometric verification of the emergency condition, and the log book with the first due test date entered. Where fittings were converted rather than replaced, the declaration for the modified assembly and the name of whoever holds responsibility for it — see emergency lighting in a retrofit.
9. The batch reference and reserved spares, with where they are stored and what they are for. Colour matching a replacement two years later is impossible without this and trivial with it.
10. Thermal evidence for the harsh locations — in-situ temperature measurements where they were required, and the declared t_a for each location so that a future change of use can be assessed against it.
11. The maintenance schedule: cleaning intervals and method, group replacement strategy, and the maintenance factor the design assumed. A maintenance factor is a promise about future cleaning, and a building that does not know what was promised cannot keep it.

What a witnessed acceptance test should witness

A witnessing exercise that consists of walking the floor and observing that the lights are on has verified nothing that was in doubt. Four tests are worth the time, and each of them tests a thing that fails silently.

1. Illuminance on the specified grid, at the specified reference plane, with daylight excluded or accounted for. Compare against the calculation, not against the specification — the calculation is what the contractor undertook to deliver.
2. A full-duration emergency discharge with illuminance measured on at least one escape route during it. The discharge alone proves the battery; the measurement proves the design.
3. Control scenario walk-through: every scene, every sensor, every override, at the settings recorded in the handover pack, with somebody ticking them off a list. Sensors bound to the wrong zone are invisible until somebody deliberately looks.
4. A fitting replacement, timed. Swap one luminaire and restore it to its commissioned state using only the handover pack and no phone calls. This single test finds more missing documentation than any review of the documents themselves, because it tests whether they are sufficient rather than whether they are present.

Making it happen

Three mechanisms, in descending order of effectiveness.

Tie the pack to a payment milestone. Not to practical completion, which arrives under schedule pressure with everything unresolved, but to a defined release after it, with the document list attached as a schedule to the contract.

Name a recipient. Documents delivered to "the client" arrive in a project mailbox that is closed six months later. Name the facilities role that will hold them and require confirmation of receipt.

Specify the format. A configuration backup in a proprietary format whose software is not also handed over is not a backup. Drawings as PDF only cannot be altered for the next refurbishment. Say what is wanted; the cost of saying so is zero.

None of this is lighting engineering, and all of it determines whether the lighting engineering survives the first change of tenant. It is the cheapest part of the project and the first part to be dropped.