Apparatus, method, and system for monitoring and maintaining light levels at target area for lighting system
First Claim
1. A method of maintaining a light output of a lighting system comprising a plurality of lighting fixtures, each lighting fixture including at least one light source, and providing a minimum light intensity quantity to a target area comprising:
- a. measuring light quantity of at least one light source of the lighting system;
b. measuring temperature of at least one component of the lighting system; and
c. adjusting power provided to at least one light source of the lighting system based at least in part, on the (i) measured light quantity and (ii) measured temperature;
d. so to maintain at least said minimum light intensity quantity to the target area for a period of time.
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Accused Products
Abstract
A method of sensing magnitude of lumen depreciation not only of a lamp of a lighting fixture, but other factors, by sensing a relative light level external of the lighting fixture to derive not only lamp lumen depreciation but total lumen depreciation from the fixture. An apparatus of monitoring light level of one or more lighting fixtures comprises a sensor positioned external of the lighting fixture(s), a comparator adapted to compare a measured actual lumen output signal from the sensor to a pre-set reference or threshold lumen output value. An error signal is generated by the comparator if the comparison indicates actual lumen output to have dropped below the reference or threshold lumen output. An alarm or communication can be actuated by the error signal to instruct corrective action to ensure relatively constant light levels to be maintained for the lighting system over time, thus providing ongoing assurance to the end user of proper system operation.
30 Citations
18 Claims
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1. A method of maintaining a light output of a lighting system comprising a plurality of lighting fixtures, each lighting fixture including at least one light source, and providing a minimum light intensity quantity to a target area comprising:
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a. measuring light quantity of at least one light source of the lighting system; b. measuring temperature of at least one component of the lighting system; and c. adjusting power provided to at least one light source of the lighting system based at least in part, on the (i) measured light quantity and (ii) measured temperature; d. so to maintain at least said minimum light intensity quantity to the target area for a period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of maintaining a lighting system comprising a plurality of lighting fixtures, each lighting fixture including at least one lamp, and providing a minimum light intensity quantity to a target area comprising:
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a. sensing light quantity of at least one light source of the lighting system from a location outside the lighting fixture; and b. assuming responsibility of maintaining the minimum light intensity to the target area within a range and for a period of time. - View Dependent Claims (15, 16, 17, 18)
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Specification