Hi Arno and thanks for all your help in the past. I have an issue with landing lights for the default B737-800. In essence I have been working on night improvements for the default B737 and so I have added two _LM textures using MCX in order to highlight the cockpit. It works well but when I save the revised model, the "attached object editor" is also updated meaning that the landing and taxi lights are permanently on because the effect parameters are set to zero . I do not want to change the default effect parameters so is there a way to "Save only changes"? If I delete these lights, I lose the taxi and landing light ground light cone which is taken from a texture file. Is there a way to put the landing light cone, rather than just the light, into the Aircraft/[Lights] section? Many thanks, Charlie.