How to Verify a Chinese Supplier Is a Real Factory, Not a Trading Company

Most people who search for a Chinese supplier are not looking for a product. They have a brand, a market, and a spreadsheet, and the first thing they need to know is whether the company on the other end of the chat controls a production line or just a website.

The two are both legal businesses. A trading company is not a criminal category and many are excellent to work with. The problem is that they charge you factory prices for a factory’s work and take responsibility for nothing that happens after the goods leave the port.

This page is the verification procedure we would want a buyer to run on us. We manufacture LED grow lights in Shenzhen, so read it with that bias in mind. Every check below works on us too, and we would rather you run it than take our word.

Start with the business licence, not the website

Ask for the business licence as a clear photo. On it there are three fields that matter more than the company name.

Unified social credit code. Eighteen characters, and it is the single most useful string in Chinese supplier verification. It is a company-level identifier, so it cannot be copied from another supplier or faked by design.
Registered address. Compare it against the factory address the supplier gives you.
Legal representative. The person named is legally responsible for the company.

A supplier who says the licence is confidential, will show it on a video call but not send a photo, or offers a licence belonging to a different company than the one quoting you, has already told you something. We send ours before you ask twice.

Look the code up yourself

This is the part most people skip, and it takes about two minutes.

Go to the National Enterprise Credit Information Publicity System and search the unified social credit code. The site is in Chinese, but the code is all digits and uppercase letters. From the result you can confirm the company exists, is still registered, and see its registered business scope.

Read the business scope for words that describe manufacturing rather than only reselling. A company that only trades will show trade language and no production scope. A manufacturer will show manufacturing language covering the category you are buying.

The same information is visible on Chinese business-information services, which are often easier to read in English. Whichever route you use, the code is what makes the answer trustworthy.

If the search returns nothing at all, stop there. Do not proceed to samples.

Compare the registered address with the factory address

This is the fastest structural test, and it is the one most often overlooked.

If the registered address and the factory address are the same, and that address is an industrial building rather than an office suite, you are probably dealing with a manufacturer. If they are different, you are almost certainly dealing with a trading company, whatever the website says.

Two refinements:

Industrial districts are real but shared. An address in a Shenzhen light-industry park can hold forty companies. It is still a better sign than an office tower, but it is not proof.
Registered addresses can be stale. Chinese companies sometimes keep an old registered address after moving. So a mismatch is a strong signal to investigate, and a match is not a guarantee. It is a filter, not a verdict.

Ask the questions only a factory answers instantly

A trader has good photographs and a smooth answer. A factory has a specific, slightly boring one. Try:

Which production line makes your order, and what else is on that line this week?
Who designs the driver, your in-house team or an external supplier?
Can I visit, and how much notice do you need?
If my volume triples, which part of the process becomes the bottleneck?

The last question is the useful one. A factory answers with a specific constraint: a component lead time, an SMT queue, a coating capacity. A trading company answers with reassurance.

Walk the line on video, and ask questions while you watch

Travel is impractical for a first order, so ask for an unedited video walk from the office to the assembly floor. Ask for it live if you can, because a recorded video is easy to stage.

While you watch, ask questions. The answers tell you more than the footage does. Where does a rejected unit go? What is on the burn-in rack right now? How many people are working the SMT line? Which products are physically present on the floor that match their labels?

Three places reveal a real process:

The incoming-inspection bench. Components arrive from third parties. A factory that inspects incoming diodes and drivers will catch defects that a factory inspecting only finished goods ships to you.
The burn-in rack. Fixtures running before packing. If it is absent, early failures become your warranty problem.
The packing area. This is where the uniformity of a real production run shows, and where a trader assembling units from mixed batches also shows.

A facility with nowhere to put a bad component is a facility that ships it to you.

Check whether the certificates belong to them and to your model

Certificates are the most commonly mishandled document in this industry.

Take each certificate number and verify it directly against the issuing body’s database, not against a PDF the supplier emailed you. Then confirm three separate things:

The certificate covers the exact model you are buying. A report for a 45W panel does not cover a 120W bar.
It is current, not an older revision of a similar product.
Whose name it is issued in.

That last point is the expensive one. A test report issued in the factory’s name may not let you apply your own brand without re-testing, which adds weeks and cost exactly when you thought the project was finished. Ask about it before you commit, not after.

For certification expectations by market, see how to choose an LED grow light manufacturer, which covers certificates, QC, payment terms, and the warranty conversation in detail.

Run the arithmetic on the claims

Any fixture can be described as high efficiency. Ask for numbers with units:

Efficacy in umol/J, not lumens per watt. A grow light quoted in lumens per watt is telling you they do not have the horticulture number.
PPF of the specific model, in umol/s.
A PPFD map at a stated mounting distance over a stated footprint.

Then check the multiplication yourself. A 45W fixture at 2.5 umol/J is about 113 umol/s. If you have been quoted 45W at 4.5 umol/J, the number is not real. Run our figures through the PPFD and DLI calculator and tell us if a model we quote does not make sense. We would rather reissue the spec than have you find it in month three.

Check the price against the volume

A price that is too good is a verification signal in itself.

If someone offers two pieces at factory price, they are not a factory. Factory pricing is an output of production economics: material costs, amortised tooling, SMT time, testing, packaging, and volume. It does not survive being broken into retail-sized quantities.

Two more patterns worth noting:

A supplier whose price barely moves between 100 units and 10,000 units is not pricing from a production plan.
An unusually low quote that excludes certification, packaging, or freight is not cheaper. It is a different scope that becomes your problem later.

When to accept a trading company anyway

None of this means you must avoid trading companies. They are a legitimate and sometimes better choice when:

Your volume is genuinely small, below the point where a factory will engage.
You need a product that already exists and is well made, with no customisation.
Your market is one you do not know well and you want someone local to absorb the complexity.
You value one point of contact over direct control of the line.

If you do work with one, hold them to the same standard anyway: ask for their upstream factory, put their name on the contract rather than only the factory’s, and specify the deliverable so there is no room for equivalent-product substitutions.

A short version

If you have fifteen minutes, do these five things:

Ask for the business licence and read the unified social credit code.
Look the code up in the National Enterprise Credit Information Publicity System and read the business scope.
Compare the registered address with the factory address.
Ask for a live, unedited video walk and ask questions while you watch.
Verify each certificate number with the issuing body, and check whose name it is in.

A supplier that answers all five specifically, the same day, without asking for a deposit, is rare. Most answer all five vaguely.

Where to start

How to choose a grow light manufacturer - the twelve questions to ask any supplier, including us.
What MOQ really means for LED lighting orders - the number most often quoted in a way that hides the real commitment.
Our OEM and ODM process - the actual production sequence, so you can compare it against ours.
OEM and ODM services - what we offer, in what form, and who we are not the right supplier for.

If the checks pass and you want to compare us against another factory, send us your market, target plants, wattage, and annual volume and we will come back with a technical proposal, expected PPFD and efficacy, and a quotation.

FAQ

Is it illegal for a trading company to call itself a factory?

No. Both business types are properly registered, and presenting yourself as a manufacturer while operating as a trading company is a misrepresentation rather than a criminal category. It matters commercially because the trading company cannot control lead time, quality, or tooling, and those are the three things you are paying a factory for.

It is the eighteen-character company identifier issued by the Chinese government, roughly equivalent to a registration number. It appears on the business licence and can be looked up on the National Enterprise Credit Information Publicity System at gsxt.gov.cn.

Can I verify a supplier without ever speaking to them?

Partly. The business licence, the credit code lookup, and certificate verification are all remote checks. What you cannot do remotely is confirm that the building is actually producing your category of product, which is why a live video walk matters.

How long does a factory audit take?

A virtual verification like the one described here takes under an hour. A third-party on-site audit is a different thing, usually one to two days, and is worth doing on a first order above a few thousand units rather than relying on video alone.

Should I pay for a third-party supplier verification service?

For a first order large enough to matter, it is reasonable. It buys independence, which is the thing your own checks cannot buy. For a smaller first order, the five steps above plus a live video walk will surface most problems at no cost.