I doubt you will get it to work. The PCR606 is an SCR and the COB is probably producing trigger pulses rather than a continuous signal. In any case, you would want to connect the LEDs in the collector of the transistor because at the momant, to turn the transistor on you have to put (0.6 + total Vf of all the LEDs) volts on it's base and that is almost certainly more than the COB can produce. Try moving the LED's to the colector and adding a resistor, I suggest 2,200 Ohms between the base and the COB output.
Usually, PCR606 is used to drive LEDs which are fed from AC or rectified but not smoothed DC. It relies on the voltage dropping to zero at each half cycle to turn the PCR606 off.
Brian.