a broad spectrum

:  having ample extent from side to side or between limits

:  having a specified extension from side to side

:  extending far and wide :  spacious

:  in a broad (see ¹broad 3a) manner :  fully

:  a continuum of color formed when a beam of white light is dispersed (as by passage through a prism) so that its component wavelengths are arranged in order

:  any of various continua that resemble a color spectrum in consisting of an ordered arrangement by a particular characteristic (such as frequency or energy): such as

:  electromagnetic spectrum