Energy conserving automatic light output system

Details Energy conserving automatic light output system Energy conserving automatic light output system

H - Electricity

05

B

315/32

H05B 41/38 (2006.01) G05D 25/02 (2006.01) H05B 41/392 (2006.01) H05B 41/42 (2006.01)

Patent

CA 1128604

ABSTRACT OF THE DISCLOSURE An energy conserving lighting system is provided wherein a plurality of fluorescent lamps are powered by a poorly regulated voltage supply which provides a decreasing supply voltage with increasing arc current so as to generally match the volt-ampere characteristics of the lamps. A trans- istor ballast and control circuit connected in the arc current path controls the arc current and hence the light output in accordance with the total ambient light, i.e., the light pro- duced by the lamps together with whatever further light is produced by other sources such as daylight, In another embodi- ment, a transistor ballast is utilized in combination with an inductive ballast. The transistor ballast provides current control over a wide dynamic range up to a design current maxi- mum at which maximum the transistor is saturated and the in- ductive ballast takes over the current limiting function.

297162

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