Here is something you can try at home: Any cellphone camera or DSLR camera will allow you to see IR light from a TV or other remote. Best to use a DSLR like we did, so you can turn off the Auto-Focus (which uses IR). But even with a cellphone, you can adjust the angle to eliminate confusion from the Auto-Focus beam. But anyway, here is a video (without auto-focus) that clearly shows an Astrodon Luminance filter blocking IR light.