Near infrared light is invisible to the naked eye. All our devices come with the standard layout of red 660nm light and near infrared 850nm light. If your red light LEDs are working, your near infrared LEDs should be as well. All devices can be operated with red and NIR (near infrared) independently, with the exception of the Vellgus Red Light Mini. One way to test your devices is to turn off your red light, but leave NIR light running. You should see a very faint illumination of the NIR LEDs.