Technically, the higher the wavelength with the LED, the more infrared light it can create but of shorter illumination range. This light might be just about invisible to your human eye but images captured from the light sensitive digital camera is often highly noticeable. Other science instruments on board Chandra https://kylerlsvxx.mdkblog.com/33322605/a-secret-weapon-for-infrared-light-for-night-vision-scope