Square modular LED recessed downlight for indoor use, consisting of an LED module, die-cast aluminium heat sink, reflector with integrated anti-glare ring, diffuser, and external supply unit. All components can be retrofitted and replaced without tools. The integrated diffuser provides optimum diffusion for very high uniformity. High-quality thermal management is achieved with the die-cast aluminium heat sink featuring FAST Flexible Air Stream Technology. Includes an electronic converter and is DALI dimmable. Suitable for ceiling panel thicknesses of 1-25 mm. Tool-free, installation-friendly mounting with a Wieland plug connector. Additional equipment includes a high-gloss modular radial louvre reflector with an integrated frame made of metallised injection-moulded ABS, ensuring a light-tight connection to the LED module. The reflector features an integrated anti-glare ring made of injection-moulded ABS in white, also providing a light-tight connection to the LED module and a frosted plastic disc (IP54).