With VELUX Sun Tunnel Accessories you can upgrade or extend your sun tunnel. With the VELUX Light kit you are given the possibility of light 24 hours a day. The VELUX Low u-value lowers the u-value of your sun tunnel, which is becoming increasingly more important. If you need or want an extension on your VELUX Sun Tunnel, the VELUX ZTR Rigid Sun Tunnel Extension is available. This is used to make additional length between the roof and the tunnel.