How far light travels through water, or more specifically how far colours of the spectrum travel, is not a factor most Carp anglers will ever need to consider as all colours of the spectrum will travel at least 15ft. As the table shows, unless you are fishing in depths more than 15ft you can be assured that the colour of your bait is still visible. Although the colours do not travel further than their stipulated distance, conditions can play an additional factor in the equation. Also remember that their eye sight underwater is far superior to ours and although the colour may not be visible, it doesn’t completely disappear.