No, LEDs are far wider than low pressure sodium, which is two about 0.1nm wide (thermal broadening, IIUC basically Doppler effect between the emitting particle

No, LEDs are far wider than low pressure sodium, which is two about 0.1nm wide (thermal broadening, IIUC basically Doppler effect between the emitting particle and the surrounding world/containment vessel) lines 0.56nm apart. See https://lambdasys.com/uploads/LLE-2.pdf https://lambdasys.com/uploads/LLE-2.pdf for a measured spectrum that's not as coarse as the one on en-wiki where both lines are blurred together. LEDs are 10~50nm, untuned laser diodes 1~10nm. It is my understanding that it's easy to make a filter for the camera that very selectively targets this line pair, though it may entail mild optical complications as a sub-nm pass/reject bandwidth detunes from sideways angles, so lenses may need to collimate the light first before feeding the filter, and de-collimate again after.