There is employed a lamination structure of semiconductor substrate in which light receiving part having a photoelectric converting function is formed in an inner portion, and insulating films and wirings. The illumination device furthermore has an optical element disposed downstream of the light emitting diode in a main emission direction, the optical element being configured for directing a first portion of the electromagnetic radiation emitted by the light emitting diode during operation through the circuit board in a direction away from the circuit board. In the event that a particular user requires a particular resource, access slots are requested through the control channel, allocated to the user, and allocation information is passed back to the requesting user through the control channel. The first and second bale teeth are selectively movable towards and away from the third and fourth bale teeth.