Crossword Genius

Range of wavelengths (4)

Ross

I think it could be either:

Which length description are you looking for?:

4

8

spectrum

(Other definitions for spectrum that I've seen before include "Array, range" , "'Broad range, scope (8)'" , "Bands of colour in crumpets" , "All the bands of colour seen in a rainbow" , "Wide range" .)

I've seen this clue in The Guardian.
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