Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1990-02-20
1992-09-08
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315DIG4, 315324, 315245, 315319, H05B 4123
Patent
active
051461390
ABSTRACT:
An inverter-type fluorescent lamp ballast is powered from the power line by way of a common and either of two (or more) different power leads. When powering the ballast by way of the common and the first one of these two power leads, the power provided to the ballast's fluorescent lamp load is relatively low; when powering the ballast by way of the common and the second one of these two power leads, the power provided to the ballasts's fluorescent lamp load is relatively high. In a lighting system, the power leads from each of several such ballasts are parallel-connected and controllably powered from the power line by way of a combination of two ordinary single-pole single-throw wall switches; such that when one of the two wall switches is in its ON-position, the amount of light provided is relatively low; but when the other one of the two wall switches is in its ON-position, the amount of light provided is relatively high. Alternatively, the several ballasts can be powered from a single special wall switch with a Triac-type voltage controller, thereby providing for a continuous range of light output control.
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Dinh Tan
LaRoche Eugene R.
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