| 摘要 |
<p>The present invention provides a lighting device which includes: a lighting unit; and a power source device which converts commercial alternating current power to supply electric currents to the lighting unit. The power source device controls the volume of electric currents based on time and maintains brightness of the lighting unit to be constant. Therefore, the LED lighting device can maintain a constant brightness until the end of the life span of the LED light device by adjusting a decrease in the light intensity as the LED lighting device is used for a long time. Moreover, driving current values and output current values of a converter can be uploaded to the converter in a digital file format. Therefore, various electric current values can be set on the LED lighting device.</p> |
