I don't think that is accurate, there are a whole lot of frequencies that are bellow red, just like there are pretty much about as infinite many above violet; X-rays aren't the same thing as what comes out of those UV lamps that charge glow in the dark material and light up fluorescent ink, you know?


I'm pretty sure the frequencies emitted by warm bodies (at least those not too close to being incandescent in visible light) , are not the same frequencies as IR LEDs emit, though things like open flames and the Sun usually emit on both ranges, among others.