What is the band of colour associated with the longest wavelengths in the visible spectrum? Red is the band of colour with the longest wavelengths in the visible spectrum. Post navigationPrevious post: Name six bands of colour in the visible spectrum starting with red?Next post: What is the band of colour associated with the longest wavelengths in the visible spectrum? Leave a ReplyYour email address will not be published. Required fields are marked *Comment * Name Email Website Type in the text displayed above