| 摘要 |
PURPOSE:To improve the practical use of LED lamps by impressing voltage so that current allowing the thermal r.m.s. (root mean square) of the LED lamp to become about 100% is made to flow between the poles of the LED signal lamps. CONSTITUTION:A serial lamp group 2 is constituted of connecting plural LED lamps 1 connected in series so that the direction of polarity is turned to the same direction to current restricting resistors R in series. The LED signal lamp L is constituted by reversely connecting respective lamps 1 in parallel so that halves of the plural lamps 1 are turned to the reverse directions each other. When the voltage is impressed so that current allowing the thermal r.m.s. (root mean square) of the LED lamps to be about 100% is made to flow between the poles A and B of the signal lamp L, the working current of the lamp is increased and the light intensity of the signal lamp L is increased in the light intensity allowable range of the lamp. |
