An LED ballast mount preferably includes a housing assembly having sidewalls including a housing LED side wall and a housing opposite side wall. In this way, laser frequency control may be achieved by employing measurements from a single photodetector. The donor radio base station further controls a number of second radio bearers over a second radio interface between the donor radio base station and the relay node. Upon determining that the media content is protected, the application is employed to get a key andor a license for the protected media content such that authentication data is employed to authorize the client. This metadata hierarchy may include the current metadata category as well as related metadata categories arranged in a tree-like structure. By measuring the shift in the resonant frequency of the detectors, the applied angular rate can be determined.