Constant lumen output control system
First Claim
1. A method of providing constant lumen output control to a lumen output device, comprising:
- determining a number of operating hours for a lamp,determining a number of lamp starts for the lamp,creating a degradation value by combining the number of operating hours and the number of lamp starts,forming an output ratio for outputting power to the lamp using the degradation value and a target lamp output, andsetting a reduced power level for the lamp using the output ratio.
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Abstract
A constant lumen output control system for providing a constant lumen output throughout the life of a lamp at the mean or preset lumen level. The lumen con system (315) coupled to a lamp driver (310) initially reduces the power to the lamp (330) to prevent the lamp from being operated at power levels that result excess mean or preset lumen levels. With increased lamp usage, the lumen control system gradually increases power to the lamp to compensate for lamp lumen depreciation due to light-reducing mechanisms. By compensating for lamp lumen depreciation the lamp is operated at a constant mean or preset lumen output throughout the life of the lamp.
60 Citations
12 Claims
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1. A method of providing constant lumen output control to a lumen output device, comprising:
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determining a number of operating hours for a lamp, determining a number of lamp starts for the lamp, creating a degradation value by combining the number of operating hours and the number of lamp starts, forming an output ratio for outputting power to the lamp using the degradation value and a target lamp output, and setting a reduced power level for the lamp using the output ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lumen output control circuit, comprising:
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a timer for measuring a number of operating hours for a lamp, a counter for measuring a number of lamp starts for the lamp, a non-volatile storage device having computer-executable instructions, wherein the non-volatile storage device is configured to store the number of operating hours and the number of lamp starts; a processor functionally coupled to the non-volatile storage device and configured, by the computer-executable instructions, to create a degradation value by combining the number of operating hours and the number of lamp starts, and to form an output ratio for outputting power to the lamp using the degradation value and a target lamp output. - View Dependent Claims (9, 10, 11, 12)
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Specification