3 added a word
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If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (byintroduced by grace of the component designer?) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

enter image description here

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (by grace of the component designer) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

enter image description here

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (introduced by grace of the component designer?) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

enter image description here

    Tweeted twitter.com/StackElectronix/status/892753580423344128
2 added 107 characters in body
source | link

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is this only for userthat visible red light present as a convenience (by grace of the component designer) or as a by- isproduct of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

enter image description here

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is this only for user convenience - is it possible to have infrared light emitted without this visible red color?

enter image description here

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is that visible red light present as a convenience (by grace of the component designer) or as a by-product of emitting actual infrared light?

Is it possible to have infrared light emitted without this visible red color?

enter image description here

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source | link

If Infrared not visible, why the red LEDs?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted?

Is this only for user convenience - is it possible to have infrared light emitted without this visible red color?

enter image description here