Direct answer: A mains-powered LED luminaire with no radio goes through a Supplier’s Declaration of Conformity under FCC Part 15 Subpart B: you test to Class A or Class B limits, a US-based responsible party signs the declaration, and there is no FCC ID. Add Bluetooth, Zigbee or Wi-Fi and the product needs certification under Subpart C with an FCC ID, while the assembled fixture still has to meet Part 15B. Most import failures are not marginal test results — they are a driver report that covers a component instead of the fixture, a Class B claim on hardware tested to Class A, or a label and manual that never carried the required statements.
Three paths, and the one-line test that picks yours
The FCC does not authorize “lighting”. It authorizes radio frequency devices, and the category depends on what the electronics do. Ask one question first: does the product deliberately transmit?
- No transmitter, mains powered. A switch-mode LED driver generates timing signals well above 9 kHz, which makes the luminaire an unintentional radiator under Part 15 Subpart B. The authorization route is SDoC — self-declaration backed by testing at an accredited lab. No FCC filing, no ID number.
- Transmitter inside. Bluetooth, Zigbee, Wi-Fi or a proprietary 2.4 GHz radio makes it an intentional radiator under Subpart C, which requires certification by a Telecommunication Certification Body and a granted FCC ID.
- RF energy makes the light. Induction and electrodeless lamps are RF lighting devices and sit under Part 18, with their own limits. A conventional LED driver is normally handled under Part 15B, but classification depends on the operating principle — get the lab to state it in writing before you quote a test package.
SDoC has one requirement importers routinely miss: the responsible party must be a legal entity located in the United States. An overseas factory cannot sign its own declaration for the US market. That role falls to the importer, and the address on the declaration has to be real.
Class A or Class B is a marketing decision with legal consequences
The class is not a quality grade. It describes the environment the product is marketed for. Class B covers residential use and carries the tighter limits; Class A covers commercial, business and industrial environments. Both are legal for the right product, but a fixture sold into homes cannot hide behind a Class A label.
There is roughly 10 dB between them once you normalise the measurement distances, which is a large margin in EMC terms. That gap is why the class has to be fixed before the first pre-scan: it decides filter cost, PCB layout and sometimes the enclosure. Deciding “Class B later” means redesigning the driver.
The limits, side by side
| Measurement | Class B (residential) | Class A (commercial / industrial) |
|---|---|---|
| Conducted, 0.15–0.5 MHz | 66 to 56 dBµV QP / 56 to 46 dBµV average | 79 dBµV QP / 66 dBµV average |
| Conducted, 0.5–5 MHz | 56 dBµV QP / 46 dBµV average | 73 dBµV QP / 60 dBµV average |
| Conducted, 5–30 MHz | 60 dBµV QP / 50 dBµV average | 73 dBµV QP / 60 dBµV average |
| Radiated, 30–88 MHz | 40.0 dBµV/m at 3 m | 39.1 dBµV/m at 10 m |
| Radiated, 88–216 MHz | 43.5 dBµV/m at 3 m | 43.5 dBµV/m at 10 m |
| Radiated, 216–960 MHz | 46.0 dBµV/m at 3 m | 46.4 dBµV/m at 10 m |
| Radiated, above 960 MHz | 54.0 dBµV/m at 3 m | 49.5 dBµV/m at 10 m |
Read the last four rows carefully. The numbers look close, but they are measured at different distances, and field strength falls roughly 20 dB per decade. A 10 m Class A limit converted to 3 m is about 10 dB looser than the Class B number in the same row.
For LED drivers, conducted emissions between 150 kHz and 5 MHz are usually the hard part, and the switching stage and the input filter decide them.
The component trap: a driver report does not cover a fixture
This is the most expensive misunderstanding in the category. A test report on a driver alone is evidence about the driver, not authorization for the luminaire — and the safety listing is a separate file, as UL 1598 and UL 8750 make clear. Radiated emissions depend on the enclosure, the cable routing, the LED load and the dimming state, none of which existed on the driver test bench.
There is no “modular approval” shortcut for unintentional radiators. Modular approval in Part 15 applies to radio transmitters, not to power supplies. The driver report is useful as pre-scan evidence; it cannot be carried into a fixture DoC as if the fixture had been tested.
When you buy a driver with a “FCC compliant” note, ask three things: was the test run on a complete luminaire or on a standalone sample, which load and dimming condition was worst case, and does the report include photographs of the test set-up. The rules require the report to identify the equipment under test, the cable arrangement and at least two photographs of the set-up.
Wireless luminaires: FCC ID, module grants and the host label
Adding a radio changes the authorization, not just the paperwork. In the 2.4 GHz band, a digitally modulated transmitter is limited to 1 W peak conducted output, and any antenna gain above 6 dBi must be offset by an equal reduction in conducted power. Products that also use 5 GHz bands need the U-NII requirements, including dynamic frequency selection where the band requires it.
Most OEMs do not certify a radio from scratch. They buy a pre-certified module and reference its grant. Two conditions decide whether that works. First, the module’s grant conditions have to match your design: same antenna type, gain no higher than granted, and the separation distance assumed in its RF exposure evaluation. Second, the host still needs its own Part 15B compliance, because the fixture’s driver and wiring were never part of the module test.
The label then carries both identities. The fixture shows its own Part 15 statement and, where a module is used, a “Contains FCC ID” line with the module’s identifier. An FCC ID has two parts — a grantee code assigned to the company and a product code chosen for the model — and it must be searchable in the FCC’s equipment database. A number that returns nothing is a red flag, not a typo.
Labels and manuals are the cheapest place to fail
Three statements do most of the work, and all three are routinely missing on imported fixtures. The device label must carry the Part 15 sentence about accepting interference. The manual must carry the Class A or Class B notice, and the wording differs: the Class A note warns that residential operation is likely to cause interference at the user’s expense, while the Class B note offers troubleshooting steps. And the manual must warn that changes or modifications not approved by the responsible party can void the user’s authority to operate.
| Document | What it proves | Common red flag |
|---|---|---|
| Test report | Limits met, on a defined sample and set-up | Driver-only test presented as fixture compliance |
| Signed DoC | Responsible party accepts legal liability | Factory signs it from overseas |
| FCC ID grant | Radio certified by a TCB | ID not found in the FCC database |
| Module grant | Radio approved as a module, with conditions | Antenna gain or distance outside the grant |
| Label artwork | Statements and ID match the authorization | Part 15 sentence missing or reworded |
| User manual | Class A / B notice and modification warning | Class B wording on an Class A product |
Records, the Covered List and what an audit actually asks for
SDoC is self-declaration, which means the file is the authorization. The responsible party must keep design records, production test procedures and the full measurement record. Retention runs for two years after the model is permanently discontinued; certified equipment carries a one-year requirement. A file that cannot be produced on request turns a compliant product into a non-compliant one without any new testing.
Since 2023 the file also needs a signed certification that the equipment is not produced by an entity on the FCC’s Covered List. That statement is about the supply chain, not the emissions, and it is the item most often missing.
At the border, import is permitted for defined exceptions — a limited number of units for testing, a smaller number for trade show demonstration, a few for personal use. They are narrow and time-bound, not a route to market. Marketing before authorization, including displaying an unauthorized device at a trade show, is itself a violation, and forfeitures are assessed per violation and adjusted for inflation each year.
A purchase-order checklist that closes the gaps
- State the classification in the PO: Part 15B SDoC, Part 15C certification, or Part 18 — and require the lab’s written basis for it.
- Fix the class in writing: Class A for commercial-only channels, Class B if any residential claim is made.
- Require a fixture-level test report, not a driver report, naming the model, the LED load and the worst-case dimming state.
- Require a DoC signed by the US importer or another US-based responsible party, with a matching address.
- Require label artwork and the manual page carrying the notices, approved before mass production.
- For wireless models, require the module grant, the antenna specification and the host test that covers the assembled fixture.
- Keep the full file for the retention period, including the Covered List certification.
| If you hear this | What it usually means | What to do |
|---|---|---|
| “The driver is FCC certified” | A component report exists | Ask for the luminaire-level report |
| “It is Class B, same as the last model” | No new test was run | Require a report for this model and load |
| “The module has an FCC ID” | Radio is approved, host is not | Test the assembled fixture to Part 15B |
| “We will add the label later” | Label was never reviewed | Approve artwork before production |
Frequently asked questions
Does an LED luminaire need an FCC ID?
Only if it contains a transmitter. A mains-powered LED fixture without a radio is an unintentional radiator under Part 15B and is authorized by SDoC, with no ID. A fixture with Bluetooth, Zigbee or Wi-Fi needs certification and an FCC ID for the radio, plus Part 15B compliance for the fixture itself.
Can I use a Class A driver in a Class B fixture?
No. The class applies to the assembled product, and the limits are measured at the luminaire level. A driver tested to Class A limits cannot be assumed to bring a fixture into Class B; the enclosure, wiring and load all affect the result.
Is SDoC valid forever?
It has no expiry date, but it is only valid for the design that was tested. Changing the driver, the LED load, the housing or the wiring can invalidate it, and a major change requires re-testing. Records must be kept for two years after the model is discontinued.
Who is the responsible party for a Chinese factory exporting to the US?
The importer, or another legal entity located in the United States that accepts the liability. The factory can supply test data and draft documents, but it cannot be the responsible party for SDoC purposes. If nobody in the chain will sign, the product is not properly authorized.
Does CE testing help with FCC?
Only as engineering evidence. EN 55015 and CISPR 15 test methods overlap with FCC conducted and radiated measurements, but the limits, the class definitions and the authorization procedure are different. A CE test report is not an SDoC and cannot be filed as one.
This article is a procurement guide, not legal advice. Confirm requirements for your specific product and market with a qualified compliance provider.
