A factory tour can be impressive and still tell you nothing. Production lines look busy whether or not the quality system works. The difference is in the documents, and most buyers do not know which ones to ask for.
Ask for the certificate and read the scope. A certificate covering a driver is not a certificate covering a complete fixture. Confirm that the model you are buying appears in the technical file, and note the reference number so it can be checked independently.
Every batch of LEDs, cells and panels should be checked on arrival. Ask to see a recent record and what happens when a batch fails. A factory that rejects material has a system; one that never rejects anything has a problem.
Finished units should run under load before packing. Ask how long the run lasts, what is monitored, and what happens when one unit in a batch fails. The answer reveals whether aging is a process or a photo opportunity.
| Document | What it proves |
|---|---|
| Certificate with scope | The model is actually covered |
| Incoming inspection log | Components are checked, not assumed |
| Aging test record | Failures are caught before packing |
| Salt spray report | Coastal claims are tested |
| BOM with part numbers | The next container matches the sample |
| Spare-parts list | Service is possible after the sale |
For coastal and port projects, ask for the test duration and the result, not just a claim of corrosion resistance. Check whether the bracket and fasteners were included, because that is where salt damage usually begins.
A BOM with named part numbers is the buyer’s protection against silent substitution. It also makes spare-parts ordering possible years later. Ask whether the BOM changes require written approval.
This is the document most factories do not want to show. It is also the most informative. A log that records a defect, its cause and the change made in response demonstrates a working system. A factory with zero recorded failures is not perfect; it is not measuring.
“Show me what you fixed last quarter." — Auditor’s opening question
Ask for the six documents in the first hour, before the tour. The way a factory responds — prepared folder, hurried search, or vague promise — tells you more than the production line will. Then walk the floor and check whether the documents match what you see.
