输出电流不受供电电压波动的影响，实现了电路的恒流功能。
The output current is never influenced by power supply, realizing the invariableness of load current.
灯板使用恒流技术，提供稳定的输出电流，减小衰弱，保证LED的使用寿命。
The PCB, used constant current technique, provides stable output current to reduce the debility and guarantee its service life.
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