Siemens sold its stake in lighting firm Osram in October 2017. Since then, the company has had little to do with the lighting realm other than its IoT related activities. The company did first get back into the lighting world when it acquired Sensor company Enlighted. The company is now further enmeshed into the IoT and part of the lighting realm through the release of an open operating system that the company created for IoT connectivity.
MindSphere serves as a cloud-based, open IoT operating system from Siemens that can connect your products, plants, systems, and machines, to let companies use advanced analytics to harness the data generated by the Internet of Things (IoT). These products and systems can include IoT-connected LED lighting. Also, these products and systems can integrate sensors and use sensor platform from Enlighted to make the sensor upgradeable. (Ref. Coverage).
Uniquely enlighted sensors can be used by multiple systems working together to gather information. So the same sensor that is used to control lighting can also be used to control blinds for example. Other sensors are not related to lighting in any way, but luminaires can house these sensors because of the location accessibility.
So while Siemens no longer has a stake in a company that makes LED lighting, it does still make the sensors and it now offers the operating system that can make the IoT work.