Standby Power and the EU Ecodesign Regulation: What (EU) 2019/2020 Requires from Drivers

The energy consumed by lighting is not only the energy the lamps use while they are on. Drivers and connected lighting systems also draw power when the light is off, in standby and no-load conditions, and regulators have noticed. The European Union's ecodesign regulation (EU) 2019/2020, applicable since 1 September 2021, sets explicit limits for this parasitic consumption and is now a standard gatekeeper for the European market.

The regulation covers light sources and separate control gears, which is the category that includes standalone LED drivers. For a separate control gear, the standby power, drawn when the control gear is connected to the mains but the light source is off or the load is disconnected, must not exceed 0.5 watts. The no-load power, drawn when the control gear is energized with no load connected, must also not exceed 0.5 watts, provided the manufacturer declares that the product is designed for no-load operation. Both limits apply from the 2021 effective date.

The same regulation sets minimum efficiency requirements for control gear at full load. The efficiency limits are graded by power, and they have become progressively stricter in later tiers. Alongside the limits, the regulation imposes information duties: the packaging and websites must state the efficiency at full load, the standby power, the no-load power or a declaration that the gear is not intended for no-load operation, and similar data. This information obligation is why modern driver boxes carry efficiency and standby figures.

For a DALI-2 driver, staying under 0.5 watts of standby power is a genuine design challenge. The DALI interface must remain powered to listen for bus activity, the control circuitry must stay alive to respond to commands, and the power factor correction and auxiliary supplies cannot simply be switched off. Designers respond with a low-power auxiliary supply, a control loop that detects inactivity and shuts down the main power stage, and careful selection of components with minimal quiescent draw. The bus interface itself, drawing around 2 mA from the DALI bus at 16 V, is small, but it is the driver's own internal circuitry that must be optimized.

The practical impact of the standby limit is visible in the specifications of drivers sold in Europe. A driver that advertises standby power below 0.5 watts, and usually well below, demonstrates compliance-ready design. Products that cannot meet the limit are effectively excluded from the EU market for new installations, and they also fall short in markets that follow similar logic, such as the United Kingdom after its adoption of equivalent ecodesign measures.

Standby power also has an engineering significance beyond compliance. In a building with hundreds of dimmable drivers, each idling at 0.5 watts, the aggregate standby load becomes real: 200 drivers at 0.5 watts consume 100 watts continuously, about 876 kilowatt-hours per year. Reducing standby power to 0.1 watts cuts that to a fifth. For owners paying for energy 24 hours a day, standby efficiency is a measurable operating cost, not just a checkbox.

For specifiers and buyers, the verification is straightforward. The (EU) 2019/2020 declaration should be part of the driver's technical documentation, with the standby and no-load figures stated. The Ecodesign regulation replaced the earlier Regulation (EC) 1194/2012 for control gear, so certificates and declarations dated before 2021 should be treated as outdated. Asking for the declared standby and no-load values, and the full-load efficiency at the operating voltage, is a quick way to separate genuine EU-market products from those that merely resemble them.