Light irradiates readily and reliably with uniform illuminance over an entire irradiation area even if an area of an irradiation subject is large and even after lamp replacement. At least some of the discrete nozzles of the plurality are aligned one each with an ion inlet of a plurality of discrete ion inlets of the FAIMS, so that ions produced at different discrete nozzles are introduced into different portions of the FAIMS analyzer region. In some implementations the partitioning of responsibility for speech recognition operations can be done on a client by client or query by query basis.