The single most extreme geographic fact in this guide belongs to a town most readers have never heard of. Guzhen, in Zhongshan, produces around 70 percent of China's lighting and roughly half of the world's, across more than 45,000 lighting and related enterprises, exporting to over 180 countries. It is worth being precise about what that means, because it is not four giants the way white goods is. Guzhen is thousands of small and medium firms wrapped around an enormous wholesale market, where a buyer can walk a few kilometres of showrooms and specify a fixture from components sourced within the same postcode. The clustering is the product. Around it sit the industrial layers: LED packaging in Zhongshan and Foshan, and brand and channel businesses in Huizhou.
An LED lamp is four things: a semiconductor die, the package that holds and phosphor-converts it, a driver that turns mains alternating current into the constant current the die needs, and an optic. The dies themselves largely come from outside the delta. What the delta owns is packaging at a scale that is difficult to picture, with MLS in Zhongshan producing up to 70 billion packaged LEDs in a month, and Nationstar in Foshan working in the field since 1969. But the part that decides whether a lamp is any good is not the die or the package. It is the driver, and it is the cheapest thing to compromise.
Which brings the gate, and it is the most elegant one in this guide because it is invisible in a showroom and unmissable in a laboratory. Commission Regulation (EU) 2019/2020 has since 1 September 2021 imposed numerical limits on temporal light artefacts: PstLM ≤ 1.0, covering visible flicker between 0.3 and 80Hz, and a stroboscopic visibility measure limit covering the effect on moving objects between 80 and 2000Hz. That second limit started at SVM ≤ 0.9 and tightened to SVM ≤ 0.4 on 1 September 2024. Both are functions of driver ripple. A cheap constant-current driver with poor smoothing produces light that pulses at twice mains frequency, which most people cannot consciously see and which nonetheless causes headaches, makes rotating machinery appear stationary, and now fails a European product test.
The commercial consequence is specific: a lamp designed to the 2021 limit may be non-compliant against the 2024 one, so old stock and old reference designs are a live risk rather than a bargain. Ask for measured PstLM and SVM at full load for the exact lamp and driver pairing you are buying, not for the driver in isolation and not for a similar model. Then ask the other questions this category rewards: the energy label class in the destination market, whether lifetime and lumen maintenance figures such as L70 are tested or extrapolated, and the colour rendering index including R9 rather than a bare CRI number. For connected lighting, the RED cybersecurity requirements and the Cyber Resilience Act duties described on the WiFi routers page apply here too, because a smart bulb is radio equipment with a network stack.
One piece of history explains the whole category. In 2017 OSRAM sold LEDVANCE, its consumer and general lighting business and with it the right to the Osram brand in lamps, to a consortium of IDG Capital, the Zhongshan packaging manufacturer MLS and the Yiwu state asset operator. The transaction closed on 3 March 2017. The incumbent European lamp brand that many buyers still specify by name has been owned from Zhongshan for nearly a decade. Everything else on this page follows from that: the delta did not win this industry by underselling it from below, it bought the front end after taking the back end, and the flicker regulation above is one of the few remaining places where a European standard rather than a European manufacturer sets the terms.