Apparatus to retrofit an HID light fixture

Details Apparatus to retrofit an HID light fixture Apparatus to retrofit an HID light fixture

1995-10-17

1998-05-12

Pascal, Robert

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Electric switch in the condenser circuit

315239, 315DIG4, 315291, 323905, 323209, 323908, 307157, 307132E, 307126, H05B 4142

Patent

active

057511160

ABSTRACT:
An apparatus for retrofitting an HID light fixture is described in several embodiments. The apparatus is coupled in series with the secondary winding and the HID lamp of the HID light fixture. A first retrofit capacitor replaces the light fixture capacitor of the HID light fixture. A switching device is coupled in series with a second retrofit capacitor and couples the first and second retrofit capacitors in parallel in response to a normal power mode control input so that the HID lamp provides normal intensity lighting at normal power. The switching device uncouples the first and second retrofit capacitors from being in parallel in response to a low power mode control input so that the HID lamp provides low intensity lighting at low power. In another embodiment, a complete HID light fixture is described which comprises the ballast transformer and HID lamp described earlier and a first capacitor, a second capacitor, and switching device respectively corresponding to the first retrofit capacitor, the second retrofit capacitor, and switching device of the other embodiments.

REFERENCES:
patent: 4931701 (1990-06-01), Carl
"HI/LO Lighting Systems", publication by Thomas Industries Inc, date unknown.
"Automatic Energy Reduction System", HID Lamp Control Systems for Maximum Energy Savings publication by Holophane, Mar. '1992.

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