...Sp. 3, Zn. 9, 10), welche kleiner als die Betriebsfrequenz ist, sind (In accordance with the invention, an EL lamp is driven by a high frequency carrier having a low frequency envelope. In particular, the lamp is driven with bursts of high frequency signal (e.g., > 1,000 hertz) and the bursts recur at low frequency (e.g., 30-1,000 hertz). Such a signal is illustrated in Fig. 2....