Photocell temperature switch for high intensity discharge lamp f

Details Photocell temperature switch for high intensity discharge lamp f Photocell temperature switch for high intensity discharge lamp f

1987-06-22

1988-12-06

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315309, 315118, 315155, H01J 2907

Patent

active

047898100

ABSTRACT:
A temperature switch for HID lamp fixtures is provided to enable such lights to be operated at low temperatures on the order of minus forty degrees Celsius, or minus fifteen degrees Fahrenheit. In one embodiment, the switch is comprised of a thermistor circuit and a resistive photocell circuit. When the resistance of either the thermistor or the photocell exceeds the reference value, or when the combined resistance of thermistor and the photocell exceed that value, the HID lamp will be turned on. The lamp is thereby turned on when the ambient temperature becomes very cold, regardless of the amount of ambient light in order that the components of the light fixture may be heated internally for more reliable operation.

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