Too much color can damage a CRT

[lnx64]

I heard someone tell me today that if you have the color cranked up too high, you can damage a CRT.

Not sure how that's true, but just want to pick at your brains for a moment on this.

When for example, I look through a color bar generator, and crank up colors high, and look through a red filter, I DO notice that the color red is brighter than white. This would lead me to believe red is in fact putting out more intensity than the red gun is on white. Perhaps there's some truth in this?