The buyer photographs the shade. The safety file, the dimming claim, and most field failures sit in a small enclosed supply — the LED driver. Guzhen and a dozen other lighting towns will swap that brick to hit a price or to clear a reel. The fixture still looks like the sample. The dimmer on the wall no longer agrees with it, or the report in your folder describes a driver that is no longer in the box.
This piece is how to specify the driver as its own part, not as “included electronics.”
1. Name the driver like a SKU
Write manufacturer, model string, output (voltage or current and wattage), and whether it is isolated. “Our 20W driver, good quality” is not a part number. If they use a house brand that is only a sticker on a generic module, get the module’s real model as well. Two English names on two quotes can be one winding shop.
2. Dimming is a protocol, not a marketing word
Triac / phase-cut, 0–10V, DALI, and “smart” apps are different inputs. A driver that flickers on a US leading-edge dimmer may be fine on a European trailing-edge plate. Write the protocol you sell, the dimmer types you claim, and the low-end percentage you will stand behind. “Dimmable” on a sell sheet is how you inherit one-star reviews that the shade cannot fix.
3. The report follows the driver model
The fixture’s safety and EMC file assumes a specific driver. A cheaper substitute — even at the same wattage — can orphan that file. Freeze the driver model on the BOM the same way you freeze a charger nameplate. A swap is a new sample and, often, a new test. If they cannot tell you which report lists that exact model, you do not have coverage. You have a PDF from a cousin part.
4. Heat and enclosure are part of the rating
A driver rated on an open bench will cook in a sealed canopy. Ask for the temperature the vendor used and whether your housing looks like that setup. Outdoor and wet-location fixtures add a sealing story. IP on the driver and IP on the fixture are not automatically the same number.
5. Lifetime claims need a test condition
“50,000 hours” without a case temperature and a failure definition is decoration. You do not need to become an LM-80 specialist to ask: hours at what temperature, and does that match the canopy you designed. If they will not put a condition next to the hours, do not print the hours on your box.
The bottom line
In a China-made fixture, the driver is the regulated product hiding in the canopy. Specify its model, protocol, report, and thermal condition. The shade is what you photograph. The brick is what you actually shipped.
If you need the driver model and dimming line written into the purchase spec in English and Chinese, I can prepare the wording and issue a stamped set under our bilingual translation company seal when you need one. See what this covers.
Driver safety, EMC, and photometric rules depend on the destination and the finished luminaire. Verify the file that lists your exact model. General sourcing guidance, not certification advice.