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-   -   Why the red light is used as a danger signal? (http://siteownersforums.com/showthread.php?t=191388)

Robin3BD 03-25-2017 01:32 AM

Why the red light is used as a danger signal?
 
Why red? Why not another color light?:D

Victor Wilson 03-26-2017 07:50 AM

Because it's the color of blood. i think so

Ayan Das 03-26-2017 08:52 AM

Red color has got the longest wavelength because of that it is visible from long distance.


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