Led lighting device and a method to verify its lifespan

Abstract

The present invention provides an LED lighting device and a method for verifying the device's lifespan. The LED lighting device includes multiple LED light sources, a controller configured to keep time for the LED lighting device's lifespan; a low voltage DC power source configured to supply power; a light intensity sensor configured to capture illuminance data; and a display terminal configured to display received data. Further, the controller records time keeping data based on the illuminance data captured by the light intensity sensor and sends the time keeping data to be displayed on the display terminal.

What is claimed is: 
     
         1 . An LED lighting device, comprising:
 a controller configured to keep time to measure the LED lighting device's lifespan;   a low voltage DC power source configured to supply power;   a light intensity sensor configured to capture illuminance data;   a display terminal configured to display received data;   wherein the controller records time keeping data based on the illuminance data captured by the light intensity sensor and sends the time keeping data to be displayed on the display terminal.   
     
     
         2 . The LED lighting device according to  claim 1 , wherein the low voltage DC power source is connected to the controller. 
     
     
         3 . The LED lighting device according to  claim 2 , wherein the controller is a microcontroller or a digital integrated circuit controller. 
     
     
         4 . The LED lighting device according to  claim 3 , wherein the controller is connected directly to the display terminal. 
     
     
         5 . The LED lighting device according to  claim 4 , wherein the display terminal is attached to the LED lighting device. 
     
     
         6 . The LED lighting device according to  claim 1 , wherein the light intensity sensor is placed at a luminous zone of the LED lighting device; and the controller captures the illuminance data and converts the data into a luminous flux and a luminous flux maintenance factor. 
     
     
         7 . The LED lighting device according to  claim 6 , wherein the light intensity sensor is fixed on a substrate/PCB board that is also used to hold LED light sources. 
     
     
         8 . The LED lighting device according to  claim 7 , wherein the light intensity sensor is placed at the center of the substrate/PCB board. 
     
     
         9 . The LED lighting device according to  claim 6 , further comprising:
 a cup configured to be placed outside the light intensity sensor.   
     
     
         10 . The LED lighting device according to  claim 9 , further comprising:
 a shading slide configured to be placed above the light intensity sensor and on top of a LED lampshade.   
     
     
         11 . The LED lighting device according to  claim 10 , wherein the controller includes an internal timing circuit or a timing program. 
     
     
         12 . A method for verifying the lifespan of an LED lighting device, comprising:
 placing a controller and a low voltage DC power source inside the LED lighting device;   capturing illuminance data related to the LED lighting device;   measuring the LED lighting device's lifespan based on the illuminance data related to the LED lighting device;   transferring data related to the LED lighting device's lifespan to a display terminal; and   displaying the data related to the LED lighting device's lifespan in real time.   
     
     
         13 . The method for verifying the lifespan of the LED lighting device according to  claim 12 , further comprising:
 recording the illuminance data related to the LED lighting device at pre-set time intervals; and   transferring the illuminance data related to the LED lighting device to the controller.   
     
     
         14 . The method for verifying the lifespan of the LED lighting device according to  claim 13 , further comprising:
 converting the illuminance data into a luminous flux or a luminous flux maintenance factor; and   sending the luminous flux or the luminous flux maintenance factor to the display terminal.   
     
     
         15 . The method for verifying the lifespan of the LED lighting device according to  claim 14 , further comprising:
 adding the pre-set interval of time to the lifespan of the LED lighting device when the measured luminous flux maintenance factor is less than a pre-defined value.   
     
     
         16 . The method for verifying the lifespan of the LED lighting device according to  claim 15 , further comprising:
 measuring an initial light intensity value after LED light sources are warmed up for 20 minutes; and   measuring another 3 to 5 consequent light intensity values at a time interval of every 20 minutes.   
     
     
         17 . The method for verifying the lifespan of the LED lighting device according to  claim 16 , further comprising:
 comparing the measured light intensity values to an initial light intensity value to determine a variance; and   resetting the initial illuminance value if the variance is less than 10%.   
     
     
         18 . The method for verifying the lifespan of the LED lighting device according to  claim 11 , wherein the controller and the display terminal are connected to an external low voltage DC power source. 
     
     
         19 . A system for measuring a lifespan of an LED lighting device, comprising:
 an LED lighting device with one or more LED light sources;   a controller configured to keep time of the LED lighting device's lifespan;   a light intensity sensor configured to capture illuminance data related to the LED lighting device; and   a display terminal;   wherein the controller records time keeping data based on the illuminance data captured by the light intensity sensor and sends the time keeping data to be displayed on the display terminal.   
     
     
         20 . The system for measuring the lifespan of the LED lighting device according to  claim 19 , further comprising:
 a temperature sensor configured to capture temperature data of an LED light source, wherein the display terminal further displays the temperature data together with the time keeping data of the LED lighting device.