| 摘要 |
PROBLEM TO BE SOLVED: To provide a bulb type LED lamp to be operated as an power saving electric lamp in normal use and as an emergency light in emergency, or to be lit in normal use when sensing the existence of a person, for serving as a portable electric lamp when removed from a bulb base socket and for issuing an alarm.SOLUTION: The bulb type LED lamp includes a photosensor controlled LED lighting circuit to be operated for lighting it with a light source whose intensity corresponds to brightness therearound, when necessary to illuminate, and to be operated similarly with power supplied from a charging battery in emergency such as a power failure, and a function provided separately for lighting it when sensing the existence of a person. When removed from the bulb base socket, the LED lamp can be lit on or off with a switch. It is usable as a portable light source similar to a normal portable electric lamp, and it is more usable in emergency with an alarm to be turned on or off. |
