Illustrative inspection checklist

Colour consistency

Units from the order compared with each other, not with a reference alone

Output

Measured at the fitting, at the beam declared

Beam angle

Measured, because a wider beam is a different scheme

Flicker

Assessed at low dim, where most drivers are weakest

Dimming range

The lowest level before the light becomes unstable

Surface finish

Even, and free of polishing marks on visible surfaces

Earthing

Continuity on metal-bodied fittings, measured

Marking

Batch identifier legible on the fitting or its packaging

An illustrative checklist for a fictional range. A real programme defines the tolerance, the sampling method, the inspection window and the remedy if a batch fails.

The four things a programme needs in writing.

The tolerance, the sampling method, the window in which inspection happens, and what happens if the batch fails. Without all four, a failed delivery becomes an argument rather than a process.

Why flicker is on the list.

Because it is invisible on a specification sheet and obvious in a room. It appears at low dim, which is exactly where a scheme spends its evenings, and it is a driver property rather than an emitter one.