EN
Anyone can put “manufacturer” on a website. Anyone can send factory photos. A trading company can even arrange a tour of a factory it does not own. What cannot easily be borrowed is a coherent set of four independent evidence layers — the registered entity, documentation naming the supplier as the party who commissioned testing, engineering answers only a designer can give, and an unscripted live walkthrough. This guide is the verification method: what to ask, what to watch, and how to read a refusal.
RedVance is a Shenzhen factory that gets audited by buyers, in person and by video. That is why we can write this without hedging: a real manufacturer loses nothing from a rigorous checklist. Apply this one to us. If a supplier’s separate concern is whether they are a maker or a relabeler of someone else’s finished panel, that distinction is covered in our factory vs white-label guide; this guide is the verification procedure itself.
Why one layer is never enough
| Layer | What it establishes | How it can be borrowed |
|---|---|---|
| Legal entity | The company is registered and real | Trading companies are registered too |
| Documents | Testing was commissioned by someone | Reports may name a different company |
| Engineering answers | Someone on the call designed the product | Hard to fake, easy to test |
| Live production view | Manufacturing exists and runs | A tour can be arranged at another site |
Read the right-hand column and the method becomes obvious: each layer has a workaround, but the workarounds do not survive being combined. A borrowed factory tour collapses when the engineering questions start; a fluent engineer cannot explain why the certificates name a different entity. Verification is about the consistency across layers, not the strength of any one.
Layer 1: the entity
- Business licence — the registered Chinese name and Unified Social Credit Code, verifiable against the public record. Full method in our business registration verification guide.
- Business scope — does it include production activity, or only trading and wholesale? A signal, not proof.
- Registered address vs factory address — do they correspond, and does the address look like an industrial location or an office building?
- Establishment date — check it against any “X years of manufacturing” claim in their marketing.
This layer is cheap and fast, and it filters obvious mismatches before you invest time in the rest.
Layer 2: documents that name them
The question here is not whether documents exist, but who commissioned them:
- Whose name is on the test reports and certificates? A report naming a different company means someone else commissioned that testing. That may have an innocent explanation, and it needs one — the same entity-matching check as our certification verification guide.
- Can they produce component-level documentation? LED part numbers, bins and datasheets sit in a manufacturer’s bill of materials, not a reseller’s — see our LED claim verification guide.
- Do they hold their own measurement data? Irradiance reports with stated conditions, produced in-house or commissioned by them, per our guide to reading an irradiance test report.
- Is there a revision history? Real products change over time and the maker knows why. Relabeled products have no engineering history to describe.
Layer 3: the engineering questions
The fastest and cheapest layer, and the hardest to fake. Ask these live, to whoever is presented as technical:
- “Which LED part number and bin, and why that bin?”
- “How does your driver regulate current, and why not cheap PWM?” — the driver-quality issue in our EMF, flicker and heat guide.
- “What is your thermal design target, and what happens to output over a 30-minute session?” — see our thermal drift guide.
- “What changed between this revision and the last one, and why?”
- “What are your three most common warranty failures?”
- “How do you measure irradiance — instrument, distance, thermal state?”
Layer 4: the live walkthrough
The protocol matters more than the fact of the call:
- Live, not pre-recorded. An edited video proves editing.
- You direct the camera. “Turn left.” “Show me that station.” Unscripted navigation is the whole point.
- Anchor the location — building exterior, signage, anything bearing the company name — then match it against the entity on your quote.
- Follow one unit from boards through assembly to packing.
- Watch a measurement at the testing station, with the readout visible.
- Ask for something unstageable — read out a component reel label, open a specific drawer, show today’s production schedule.
Step 6 is the one that separates a real floor from a borrowed one. The full audit procedure is in our factory audit checklist, and for meaningful order values a third-party on-site inspection is inexpensive insurance alongside your own call.
How to read a refusal
Reactions carry information, but they need calibrating rather than treating as verdicts:
| Response | How to read it |
|---|---|
| Repeated postponement of a live call | Strong signal — a factory is in that environment daily |
| Only edited videos offered | Strong signal |
| Engineering questions answered only by sales | Strong signal |
| Certain lines off-limits for client confidentiality | Legitimate and common — ask to see other lines instead |
| Cannot show a specific customer’s product | Legitimate under NDA |
| Offended by the request itself | Worth noting — these are normal B2B questions |
One more thing worth saying plainly: a trading company is not a bad partner, it is a different one. Lower minimums, easier communication, multi-category sourcing — all real advantages for small or mixed orders. The problem is only misrepresentation, and a sourcing partner who says “we work with three factories, here is which one builds this” is more trustworthy than a reseller claiming to own a plant. The trade-offs are laid out in our manufacturer and wholesale sourcing guide.
The verification checklist
- Business licence obtained and checked against the public record.
- Business scope reviewed for production activity.
- Registered address compared against the stated factory address.
- Test reports and certificates checked for whose name they carry.
- Component-level documentation requested — LED part number, bin, datasheet.
- Engineering questions asked live to a technical person.
- Live unscripted video walkthrough completed, with an unstageable request included.
- Entity matched across licence, documents, contract and payment instructions.
Passing all eight is not a guarantee of a good partner — quality, communication and follow-through are separate matters proven over a first order, starting with the sample checks in our sample evaluation guide. But failing several is a clear enough answer. Terms used here are defined in our glossary.
What a manufacturer can do about it: offer the live walkthrough before it is asked for, put an engineer on the first technical call rather than only sales, keep the entity name identical across licence, certificates, contract and invoice, hand over component-level documentation as a matter of course, and answer the warranty-failure question honestly. Every one of those makes a supplier easier to verify — which is the entire point, and the reason a factory confident in its floor treats an audit as its best sales tool rather than an obstacle.
Frequently asked questions
How do I verify a supplier is actually a factory?
Check four independent layers of evidence: the registered legal entity and its business scope, documentation that names the supplier as the party who commissioned testing, engineering answers that only the designer of a product can give, and a live unscripted video walkthrough of production. Any one layer can be borrowed or staged. All four together are difficult to fake.
What questions can only a real manufacturer answer?
Ask which LED part number and bin they use and why, how their driver regulates current, what their thermal design targets are, what changed between this product revision and the previous one, and what their three most common warranty failures are. A designer answers immediately and often in more detail than asked. A reseller defers to a third party.
Is a trading company always a worse choice than a factory?
No. A good trading company offers lower minimums, easier communication and multi-category sourcing, which suits small or mixed orders. The problem is not the model but the misrepresentation. What matters is knowing which you are dealing with before you build a brand on it, because engineering control and accountability differ significantly.
How do I run a video factory audit?
Insist on a live call rather than a pre-recorded tour, direct the camera yourself, ask to see specific stations on demand, have an engineer present to answer technical questions, watch one unit being measured at a testing station, and request something that could not have been staged, such as reading out a component reel label.
What does it mean if a supplier refuses a live video walkthrough?
For a genuine factory a live walkthrough is a routine request in a familiar environment, so repeated refusal or indefinite postponement is informative. There can be legitimate reasons such as client confidentiality on certain lines, but a supplier who will only ever send edited video has effectively answered the question.
Does a business licence prove a company is a manufacturer?
No. Registration confirms the legal entity exists, and trading companies are registered entities too. The business scope on a Chinese licence may indicate whether manufacturing is among the registered activities, but scopes are often written broadly. Registration is a necessary first check rather than proof of production capability.
Run all four layers on us
Business licence, documents naming us, an engineer on the call, and a live walkthrough where you direct the camera — book it and work through this checklist. If a supplier makes verification hard, that is the finding. We make it easy on purpose.
Book a verification call →