| CPC F21V 15/01 (2013.01) [F21V 23/003 (2013.01); F21V 23/0435 (2013.01); F21V 23/0442 (2013.01); F21Y 2103/00 (2013.01); F21Y 2115/10 (2016.08)] | 22 Claims |

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1. A coupling element configured to be disposed inside a lighting device and to form through a housing wall of the lighting device a wireless coupling interface to an extension unit external to the lighting device, said extension unit being configured for extending functionality of the lighting device beyond a basic lighting functionality to include at least one of controller interfacing and sensor interfacing.
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