In a light source apparatus, a reflector has an inner reflective surface complementary to a part of the outer surface of an ellipsoid with a pair of focal points. The DSSS signal is divided between two signal paths, one path containing a frequency band inverter and the other a time delay unit. Alternatively, where two independent pushers are utilized, the conveyor is repositionable at heights capable of receiving product sequentially displaced by each pusher by cycling the conveyor position to match the height of the currently actuated pusher. A state of the semaphore is determined.