The ULN2003A is a driver for manage the power RGB led, in the example is a 5W led.
The irremote library support this prortocols :NEC, SONY, RC5, RC6, DISH, SHARP, PANASONIC, JVC, SANYO and MITSUBISHI.
The IR receiver normally are 36 to 38KHz, depend of remote control, but are not critical.