Abstract: The discharge lamp energizing arrangement of this invention comprises a starter and a generator adapted to maintain a discharge current in the lamp. The generator includes a first circuit arranged to couple in series a D.C. voltage source, a first switch and a second switch. When the first switch is closed the second is open and vice versa. A second circuit arranged to couple an inductance and the lamp in series is connected in parallel with the second switch. The switches are operated by a control means which combines signals received from an oscillator and a comparator so as to regulate the current flow in the lamp. The generator appears as a source of stabilized current for any load which is applied thereto and may just as well be employed for a lighting fixture as for energizing the luminous points of a matrix display board.

Abstract: A discharge lamp energizing arrangement comprises a starter and a generator adapted to maintain a discharge current in the lamp. The generator includes a first circuit arranged to couple in series a D.C. voltage source, a first switch and a second switch. When the first switch is closed the second is open and vice versa. A second circuit, arranged to couple an inductance and the lamp in series, is connected in parallel with the second switch. The switches are operated by a first control means which employs the signals received from an oscillator. The starter includes a third switch connected in parallel with the lamp terminals. The third switch is operated by a second control means itself operated by the first control means. When the energizing arrangement is turned on the third switch is closed and it subsequently reopens on the first occasion that the first switch passes from the closed to the open state.

Abstract: This light emitting element comprises three differently colored luminous sources the excitation of which varies as a function of a signal developed by a physical phenomenon sensor, in particular a microphone. The analog signal emitted by the sensor is initially converted into a sequence of electrical pulses in a suitable converter. The leading edges of said pulses are next applied to a counter the output of which provides a coded signal which changes with the arrival of each such edge and thus determines a different state of excitation of the luminous sources. The arrangement as described enables changing the color of the element from a musical signal.