Since having our kitchen extended from 3m in length to 6m my wife has consistently complained that the rear of the kitchen is gloomy particularly on cloudy days.The extension part has a sloping roof so if a velux window was fitted there would be a varying distance of up to 50cms to the ceiling below which to my mind would not be aesthetically pleasing. I am therefore considering fitting a light tunnel so what I'm asking is does anyone have experience of one of these and how good are they at obtaining more light.