Patent ID: 6348766
Filing Date: 2002-02-19
Classification: H05B,Y10S

Abstract:
A LED lamp system comprising:an alternating current power source connecting portion for receiving an alternating current; a power source converting portion for receiving said alternating current and rectifying the received alternating current for generating a direct current power; LED group consisted of a plurality of LEDs and receiving a direct current power output from said power source converting portion, said LED group having a life time preannouncement portion for integrating power supply period for issuing preannouncement indicative of approaching to the end of the life, said life time preannouncement portion including: counting means for measuring said power supply period on the basis of a frequency of the alternating power source, integrating means for integrating the power supply period measured by said counting means and storing the integrated value in a non-volatile memory, and power supply mode control means for controlling illumination of LEDs at different modes including a normal lighting modes, said power supply mode control means being responsive to an integrated value of said integrating means in excess of a predetermined criterion to operate in a predetermined life time preannouncement mode.