Red is evoked by light consisting predominantly of the longest wavelengths of light visible by the human eye, in the wavelength range of roughly 630–740 nm. Wavelengths longer than this is called infrared, and cannot be seen by the naked eye.
Most people judge a site on its quality of design. Colors can play an important role in any web design layout and one of the key factors in a good website design is choosing an attractive and friendly website color. Here is a superb showcase of red website designs for your inspiration.