Importing LED lighting from China: what to check

Importing LED lighting from China so that the product does not fail at six months comes down to two decisions that appear in no photograph: which driver the luminaire carries and how much thermal margin it has. Two thirds of the cost sit in those two parts, and they are what gets cut when the price is squeezed. The check fits into one inspector-day: two hours of continuous operation with a thermometer on the driver and the heatsink, and the luminous flux measured on the assembled product, not on the chip datasheet. The usual minimum runs from 200 to 1,000 units per reference, with 20 to 40 days of production.

The economics: why LED looks simple and is not

An LED luminaire is housing, heatsink, chip, optics and power supply, and the split of the cost is not intuitive: the chip is the most visible part and the one that weighs least on the bill. What dominates is the driver and thermal management: aluminium, copper, electrolytics and assembly.

That is why a factory squeezed on price cuts there: the chip carries a brand and appears on the datasheet, the driver sits inside the housing and nobody opens it. The product works for three months, starts to flicker and by the sixth it is on the returns list. In this category the failure is almost never the LED: it is the driver, which degrades with temperature, or the heatsink, which does not dissipate what the chip generates.

The driver is the product

The first check is that the driver has an identifiable brand and model and that the supplier hands over its datasheet with the derating curve. A driver with no reference, or an evasive answer about who makes it, is the most reliable sign that it was cut there.

Three things are verified on that datasheet:

• Output current against the real load. In a luminaire with a fixed LED string the driver must be constant-current and match the module. One sized to the limit runs hot and degrades fast; one running at 70% of its capacity lasts for years.
• Input voltage range. A driver of 175–265 V, common in the Chinese market, does not work in Mexico at 127 V. For Mexico you have to ask for 100–240 V or a 127 V version. Argentina runs at 220 V and Brazil lives with both 127 V and 220 V depending on the region.
• Electrolytics. The 105 °C ones against the 85 °C ones separate a driver that ages slowly from one that bulges: every 10 °C less of operating temperature is equivalent, as a rule of thumb, to twice the life.

The second check is the temperature after two hours of continuous operation, measured on the driver housing. A wattmeter at the input, compared with the declared power, exposes a driver that delivers less than it promises. A branded driver costs several times one with no reference and is still a fraction of the sale price: cutting it is the worst economics in the project.

Lumens: the laboratory chip and the assembled luminaire

The lumen figure on the box is usually the chip’s performance in the laboratory, at controlled junction temperature and nominal current, not that of the finished, assembled product. Between the two there are real losses: the diffuser absorbs, the optics deflect, the driver converts at below unity and the chip performs worse running hot inside the housing.

There is no single loss percentage, and anyone who publishes one without measuring it is guessing. What you have to ask for is the data of the finished product: lumens of the whole assembly, efficacy in lm/W and real power, measured after thermal stabilisation — some thirty minutes of operation — and not in the first second. The measurement is made in an integrating sphere; if there is no report for the complete luminaire, the figure the supplier shows you is the chip maker’s.

Colour temperature: same model, two temperatures

A product specified at 4,000 K can deliver 5,500 K, and the difference shows when you install two lots together. The origin is in binning: the chip maker grades by flux, voltage and chromaticity, and a factory that buys whatever is available does not commit to a coordinate, only to a label. The next lot comes from another bin and the colour moves.

It is fixed in writing with two parameters: the target coordinate and the tolerance in MacAdam steps. A tolerance of 3 steps is tighter than one of 5 and decides whether you can mix lots in the same installation. It is verified with a colorimeter on a sample from the lot, also measuring the reproducibility between units.

Voltage drop in LED strips: why the far end goes dark

A long strip fed from a single end loses voltage along the copper track: the LEDs in the final stretch receive less voltage, light less and change colour. In an RGB strip the imbalance shows earlier: each channel has its own forward voltage and the mix breaks before the brightness does.

It is not a defect of the lot nor something an AQL inspection detects: it is an installation design problem, and the supplier is not responsible. The solution is also a design one: feed from both ends, inject current every certain distance or raise the voltage. Going from 12 V to 24 V halves the current for the same power, so the absolute drop is halved and, as a percentage of the working voltage, cut to a quarter.

It is checked with a multimeter: with the strip at full white, measure the voltage at the fed end and at the free end. The magnitude depends on the power per metre, the cross-section of the track and the length of the run.

IP rating: the label and reality

The IP rating describes how a closed assembly was tested, not how it ends up installed, and the leak point is almost never the housing. A luminaire can carry IP65 printed on it and mount an unrated connector, a gasket that hardens in the sun or a cable gland tightened onto the wrong cable. Real protection is that of the worst-rated component.

The first digit is dust and the second is water: IP65 is dust-tight and resistant to jets; IP67 allows temporary immersion at one metre for thirty minutes; IP68 is not a fixed value, but whatever the manufacturer declares. An IP68 with no declared conditions means nothing.

IP is a manufacturer’s declaration, not a certification, and it is worth only as much as the report backing it, which must also name the exact model and configuration, with the connector that ships. The gasket and its compression, the material, the cable gland and the sealing of the driver are reviewed. The practical test: subject an assembled unit to a water jet for half an hour and then open it.

Zhongshan and Shenzhen: where the buying actually happens

Conventional LED lighting is made in Guzhen, in Zhongshan, and there an agent based in Shenzhen has no geographical advantage. It is the world centre of the category by concentration of factories, moulds and optics, and it is the right place for a panel, a downlight or an outdoor luminaire.

Connected lighting is another business. A product with WiFi or Bluetooth and app control shares a supply chain with the radio modules and the boards, and that ecosystem is in Shenzhen. If your product carries connectivity it is worth working from here even if the assembly is in Zhongshan.

Certifications: what changes in each market

Certification is issued on the finished product and in the importer’s name, so the choice of driver and of voltage conditions the procedure. The detail by category is in the certification matrix.

In Mexico, a product NOM for electrical goods and, depending on the luminaire, an efficiency NOM; if it is smart and emits radio, homologation before the CRT is added, which took over the functions of the IFT dissolved in July 2025.

In Argentina, the electrical safety certification corresponding to the category, and ENACOM only if it emits radio. The grid is 220 V.

In Brazil, Inmetro is mandatory for luminaires and electrical material, in a procedure independent of ANATEL’s: a wireless luminaire needs both, before an OCP and an OCD.

Table: what separates an entry-level luminaire from a mid-range one

The price difference between the two steps is explained almost entirely by four line items: the driver, the heatsink, the chip bin and the actual implementation of the sealing. The housing finish and the packaging explain the rest, and they change nothing in the installation.

MOQ and lead times: what to expect before ordering

The usual minimum runs from 200 to 1,000 units per reference and depends on the product: a standard strip or panel starts at the bottom of that range, and a luminaire with its own housing and custom optics requires tooling and goes to the top. The lead time runs from 20 to 40 days and climbs to the high end as soon as there is branding, packaging or driver customisation.

The driver is usually a bought-in component, not made by the factory, so replacing it with one of a recognisable brand is often possible within the same order and without new tooling, if the format and the output current fit. Asking before closing the order costs a conversation; afterwards it has no solution.

Validation is done with two or three units — engineering, production and one sealed as a reference — on which driver temperature, real flux and colour temperature are measured. MeliPrep invoices the pre-shipment AQL inspection at USD 299 per inspector-day (ISO 2859-1 general level II, AQL 2.5 / 4.0), and the thermal measurement is part of that visit.