private void InitLightmaps( )
{
    LightmapData[] lightmapData = new LightmapData[YourlightmapNumber];

    for(int i = 0 ; i < YourlightmapNumber ; i++ )
        lightmapData[i] = new LightmapData();

    for( int i = 0 ; i < YourlightmapNumber ; i++ )
    {
        Debug.Log("Lightmap and path : Yourlightmapfolder/LightmapFar-" + i.ToString() );

        lightmapData[i].lightmapFar = Resources.Load( "LightmapsCZC/LightmapFar-" + i.ToString(), typeof(Texture2D)) as Texture2D;
    }
    LightmapSettings.lightmaps = lightmapData;
}

///// Other part of code to hide lightmaps ///////

if( bIsTimeToHideLM )
{
    //Create another empty lightmapData array
    //Do this : LightmapSettings.lightmaps = YourNewEmptyArray
}
else
{
    //If you are here so the waiting time is over
    //Do this : LightSettings.lightmaps = YourTrueLightmapArray
}