Stabilizing short-term color temperature in a ceramic high intensity discharge lamp
AssigneeKoninklijke Philips Electronics N.V.
InventorJerry Martin Kramer
Life of this patent
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Abstract
An apparatus and method for obtaining short-term color stability in an HID lamp, the apparatus comprising in a first embodiment a high intensity discharge lamp with a discharge vessel and electrodes; with a filling within the discharge vessel containing a metal halide dose of at least 20 mg/cc, where volume is defined as the volume of the main cylindrical section of the discharge vessel. In a preferred embodiment, the filling within the discharge vessel contains Hg of at least 20 mg/cc, where volume is defined as the volume of the main cylindrical section of the discharge vessel. In a yet further aspect, the resulting color temperature is stabilized independent of the shape and frequency of the current and voltage waveforms that drive the HID lamp.
Claims16
An HID lamp with short-term color temperature stability, comprising:
- a high intensity discharge lamp with a discharge vessel and electrodes, and
- a filling within the discharge vessel containing a metal halide dose per unit volume of at least 20 mg/cc, where volume is defined as the volume of the main cylindrical section of the discharge vessel and wherein the HID lamp discharge vessel has an inner length/inner diameter ratio equal to or greater than 3.
A HID lamp with short-term color temperature stability, comprising:
- a high intensity discharge lamp with a discharge vessel and electrodes, and
- a filling within the discharge vessel containing a metal halide dose per unit volume of at least 20 mg/cc, where volume is defined as the volume of the main cylindrical section of the discharge vessel, and
- wherein the HID lamp discharge vessel has an inner length/inner diameter ratio equal to or greater than 4.75.
A method for obtaining short-term color stability in an HID lamp, comprising the steps of:
- providing a high intensity discharge lamp with a discharge vessel and electrodes;
- and
- filling the discharge vessel with a metal halide dose per unit volume to at least 20 mg/cc, where the volume is defined as the volume of the main cylindrical section of the discharge vessel and wherein the HID lamp discharge vessel has an inner length/inner diameter ratio equal to or greater than 3.
A method for obtaining short-term color stability in an HID lamp, comprising the steps of:
- providing a high intensity discharge lamp with a discharge vessel and electrodes;
- and
- filling the discharge vessel with a metal halide dose per unit volume to at least 20 mg/cc, where the volume is defined as the volume of the main cylindrical section of the discharge vessel, and wherein the HID lamp discharge vessel has an inner length/inner diameter ratio equal to or greater than 4.75.
Dependencies are inferred from the claim text.