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What to check when you approve a custom lighting sample

2026-09-30 · 6 min read

The sample approval is the single point where you have the most leverage and the least time. A twelve-point check that prevents the expensive arguments later.


On custom lighting, the sample stage is the last moment when a problem costs nothing to fix. Once you have written “approved”, you own the outcome. This is the checklist we would want a customer to run against our own samples.

1. Dimensions, measured — not eyeballed

Take a photograph with a tape measure in frame, or ask for one. Compare against the approved drawing, including the drop and the mounting canopy size. Photographs taken from a low angle make a piece look larger than it is.

2. Finish against a physical reference

Screens lie about metal. A brushed brass can look gold on one monitor and grey on another. If the finish matters, ask for a physical sample panel by courier before the run — and keep it. That panel becomes the standard your production batch is judged against.

3. Colour temperature and CRI

Look at the lit sample, not the unlit one. Confirm the kelvin value and check the light quality on a real surface — skin, fabric, food. Two fixtures at nominally the same kelvin can render colour very differently.

4. Brightness distribution

Is the light even across the piece, or are there hot spots and dark patches? On a multi-arm fixture this is the most common defect, and it is almost always a driver selection or wiring-order issue rather than a design one.

5. Flicker and dimming

Record a short video with the fixture lit. Flicker frequently does not show up in a still photograph and does not show up at all in the factory under different power. Ask for a dimming test if the installation includes dimmers — incompatibility between dimmer and driver is one of the most common site failures.

6. Structural joints and assembly order

Ask how the piece arrives and in how many parts. Look for numbered joints that match a drawing. If the sample is one piece but the final fixture will be six metres, the sample told you nothing about the hard part — ask to see a joint.

7. Weight and load points

Get the total weight and the load per fixing point in writing. Your structural engineer needs it, and the question is much easier to answer before shipment than after.

8. Sharp edges, burrs and accessible live parts

Run a hand over accessible edges on the sample. On decorative metalwork, finishing quality shows up here first. Confirm that no live part is accessible without a tool.

9. Cable, chain and hardware quality

The suspension is what holds several thousand euros over someone’s head. Check the cable or chain rating, the ceiling canopy build and the connectors. This is a common place to find cost-cutting that is not visible in any photograph.

10. Packing method

Ask how it will be packed, in photographs or in writing, before the sample is approved. Frame crated or loose? Glass and crystal double-boxed? Is there a packing list with component numbering? Damage in transit is the most frequent post-shipment problem, and it is usually a packing decision made long before.

11. What is supplied with the shipment

Installation drawing, wiring diagram, component list, spare parts, cleaning guidance. Confirm this in the approval email, so there is a written record.

12. Approval in writing, with photographs referenced

Approve by email, referencing the photographs you were sent. That single habit removes most disputes: both sides are looking at the same image when they say “that is what was agreed”.

If something is wrong at the sample stage, say so immediately and in writing, with a photograph. A supplier who argues about an obvious defect at sample stage will not improve at production stage — and you have given them no deposit you cannot recover.

The one thing not to do

Do not approve a sample verbally, informally, or with a message that says “looks good, go ahead” while a question is still open. Finish the open question first. It is the cheapest hour you will spend on the project.

See it built

Films from our own workshop and from installed projects — the same process your order goes through.

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Questions

Questions about samples and approving a custom lighting prototype

Do I need a sample before ordering?
On custom work, yes, and it is standard practice for us. We build a sample or a representative section, photograph and video it under light, and send it to you for written approval. Nothing goes into mass production until you sign off. For a fully bespoke piece, the sample is the only point where a mistake is cheap, because at that stage you have one fixture rather than fifty. The sample cost is normally credited against a production order.
What should I actually check on the sample?
Five things. Light it and look for hot spots or dark patches along the frame. Check the finish against a RAL or Pantone reference in daylight, not under the LED. Check the dimensions, especially anything that has to clear an opening. Run the dimmer through its full range. And read the installation drawing against the actual fitting — if the fixings do not match your ceiling, no amount of visual approval will save the install.
How long does a sample take?
15–20 days from the approved drawing. A sample is a hand-made one-off, not a production-line item — it takes a skilled pair of hands for most of a working day, and we run samples for more than one customer at once. So the honest date depends on how much workshop time your piece needs. If you send several samples together, or the piece involves hand-blown glass, custom plating or an unusual frame, we will quote a longer date at the start rather than promise a week and hand you something you cannot approve.
What if I need changes after the sample?
Tell us, and we will quote the change. Size, proportion, finish, light colour and dimming are all adjustable at that point. What cannot be adjusted is the fundamental structure — a fixture that was built around a different frame geometry needs a new sample, and we will say that plainly rather than try to patch it. Most changes are made without a second sample, because a photograph of a changed finish is usually enough to judge it.
Is the sample cost credited against the order?
Normally yes, where a production order follows the sample. If the sample is for a piece you end up not ordering, the cost stands, and it is quoted before the sample is built so there is no surprise. For a fully custom piece we build the sample to the same standard as the production run, which is why it costs what it does — it is a real fixture, not a mock-up.
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