Well, it depends on how the circuit is connected, but in most lamps i've seen each LED is powered from a separate pin of a microcontroller, so you can just remove the LEDs you don't need without worrying about breaking the circuit.
Oh, and by the way, i hope you're not trying to make IR LED clip from this lamp - IR LEDs won't work when soldered in place of red LEDs (too little voltage).
Good luck, and don't forget to post a picture of your creation