external surfaces as shown in fig1 incident light ray 16 passes through window 17 and is channelled through panel 5 into the direction of ray 18 that penetrates upward and over the ceiling 19 deep in the interior of the room from the ceiling 19 the light is diffusely reflected into rays 20 to provide illumination to work surfaces 21 deep inside the room light rays 22 that would otherwise have intensely illuminated work surfaces 23 close to the window are entirely redirected by the light channelling panel to the ceiling towards the rear of the room usually the light channelling panel 5 is installed in the window above eye level of occupants 24 in the room to avoid the possibility of sunlight being directed upwards into occupants view occupants 24 generally have a relatively undistorted view to the outside ray 25 through the light channelling panel provided the viewing direction is near horizontal the energy conservation advantages of the light channelling panel of this invention are considerable all sunlight incident on the panel is channelled through to the room however the light channels redirect substantially all sunlight away from the floor and towards the ceiling from where it may be utilised to provide useful illumination in the room consider a panel similar to the designs in fig1 through fig9 the panel is 2 m wide and 0 5 m high and is installed in the upper part of a.