At present, the AMC7135 chip can directly drive the 1W gold wire lamp bead is 300MA one, if used in 5730, the voltage after 2 series is 6V, your battery is 3.7V and low, an IC constant current driver, CN5611 low voltage difference 30mA-800mA LED constant current driver chip, It is necessary to install a 3K OHM -10K Ohm resistor to achieve 150MA constant current