A light source that uses a light emitting diode with a wavelength converting element is configured to produce a non-uniform angular color distribution, e. A plurality of isolation structures is formed in a substrate. The inventive pneumatic shock-absorber is characterized in that an upper extension arm and a lower extension arm extend laterally from the upper support plate and lower mounting plate respectively and that the height sensor is positioned between the two extension arms. The blades of the disc act as airfoils and impart unique flight characteristics to the disc. In response to the detection, the selected at least one spot content unit is inserted into the stream at the spot location, thereby generating a stream including the one or more media content units and the selected spot content unit. At least one auxiliary device can be connected in a drive relationship with the electric machine.