The Magic Leap 2 has an RGB camera on the front of the device and 3 World Cameras that are black and white and have IR filters so the controller can be tracked. The controller uses lights that are synced with the world cameras. The ideal IR range is 750nm . Wavelengths above 770nm begin to be filtered out.
I recommend testing the lights using the World Camera sample in the MLSDK C++ and Unity 1.12.0 example applications.