Led lighting unit

An LED lighting unit comprising a support structure (14), an LED-based light emitting structure (10) mounted within the support structure and an optical beam shaping arrangement (50, 52) over the top of the support structure. The optical beam shaping arrangement comprises an optically transparent and thermally stable material, and the support structure supports the microstructured layer at a small height above the LED-based light emitting structure. This height may for example be less than 0.5mm. The optical beam shaping arrangement enables a compact and low height lighting unit to be mounted on a carrier by reflow soldering without damaging the optical beam-shaping component. LED照明单元包括支撑结构（14）、安装在支撑结构内的基于LED的发光结构（10）以及在支撑结构顶部之上的光学射束成形布置（50,52）。光学射束成形布置包括光学透明且热学稳定的材料，并且支撑结构在基于LED的发光结构上方的小高度处支撑微结构化层。该高度可以例如小于0.5mm。光学射束成形布置使得能够通过回流焊接将紧凑且低高度的照明单元安装在载体上而不损坏光学射束成形组件。