diff --git a/CVARS.rst b/CVARS.rst
index 85c9069e1..25016411c 100644
--- a/CVARS.rst
+++ b/CVARS.rst
@@ -316,6 +316,16 @@ Client-Side
 
 ..
 
+:Name: r_overBrightBitsJKA
+:Values: Integer >= 0
+:Default: "0"
+:Description:
+   Overbright on maps recognized as made for Jedi Academy. These are
+   maps loaded from basejka or fs_assetspathjka directories and maps
+   with ojka_ prefix or "compatible jka" string in mv.info file
+
+..
+
 :Name: r_saberGlow
 :Values: "0", "1"
 :Default: "1"
diff --git a/src/client/cl_cgame.cpp b/src/client/cl_cgame.cpp
index a59a550b0..fdc67159b 100644
--- a/src/client/cl_cgame.cpp
+++ b/src/client/cl_cgame.cpp
@@ -1358,6 +1358,10 @@ void CL_InitCGame( void ) {
 	mapname = Info_ValueForKey( info, "mapname" );
 	Com_sprintf( cl.mapname, sizeof( cl.mapname ), "maps/%s.bsp", mapname );
 
+	mapversion_t mapversion = CM_MapVersion(cl.mapname);
+	MV_SetCurrentMapVersion(mapversion);
+	Com_Printf("mapversion set to %s\n", MV_GetMapVersionString(mapversion));
+
 	// load the dll or bytecode
 	if ( cl_connectedToPureServer != 0 ) {
 		// if sv_pure is set we only allow qvms to be loaded
diff --git a/src/client/cl_main.cpp b/src/client/cl_main.cpp
index c3ec17165..415265515 100644
--- a/src/client/cl_main.cpp
+++ b/src/client/cl_main.cpp
@@ -750,6 +750,7 @@ void CL_FlushMemory( qboolean disconnecting ) {
 
 	if (disconnecting && !com_sv_running->integer) {
 		MV_SetCurrentGameversion(VERSION_UNDEF);
+		MV_SetCurrentMapVersion(MAPVERSION_UNDEF);
 
 		FS_PureServerSetReferencedPaks("", "");
 		// change checksum feed so that next FS_ConditionalRestart()
diff --git a/src/client/cl_scrn.cpp b/src/client/cl_scrn.cpp
index d93822d72..75172b9e4 100644
--- a/src/client/cl_scrn.cpp
+++ b/src/client/cl_scrn.cpp
@@ -405,7 +405,8 @@ void MV_DrawConnectingInfo( void )
 	Com_sprintf(txtbuf, sizeof(txtbuf), "^1[ ^7JK2MV " JK2MV_VERSION " " PLATFORM_STRING " ^1]");
 	SCR_DrawStringExt(320 - SCR_Strlen(txtbuf) * 4, yPos + (line * 0), 8, txtbuf, g_color_table[7], qfalse);
 
-	Com_sprintf(txtbuf, sizeof(txtbuf), "Game-Version^1: ^71.%02d", (int)MV_GetCurrentGameversion());
+	const char *mapverstr = MV_GetMapVersionString(MV_GetCurrentMapVersion());
+	Com_sprintf(txtbuf, sizeof(txtbuf), "Game-Version^1: ^71.%02d Map-Version^1: ^7%s", (int)MV_GetCurrentGameversion(), mapverstr);
 	SCR_DrawStringExt((int)(320 - SCR_Strlen(txtbuf) * 3.5), yPos + (line * 1), 7, txtbuf, g_color_table[7], qfalse);
 }
 
diff --git a/src/qcommon/cm_load.cpp b/src/qcommon/cm_load.cpp
index e30059a8a..214f4a6d2 100644
--- a/src/qcommon/cm_load.cpp
+++ b/src/qcommon/cm_load.cpp
@@ -61,6 +61,16 @@ void	CM_FloodAreaConnections (void);
 ===============================================================================
 */
 
+mapversion_t CM_MapVersion(const char *name) {
+	if (FS_ReadFileSkipJKA(name, NULL) != -1) {
+		return MAPVERSION_JK2;
+	} else if (FS_ReadFile(name, NULL) != -1) {
+		return MAPVERSION_JKA;
+	} else {
+		return MAPVERSION_UNDEF;
+	}
+}
+
 /*
 =================
 CMod_LoadShaders
diff --git a/src/qcommon/cm_public.h b/src/qcommon/cm_public.h
index 6c2fcd30b..c3f846599 100644
--- a/src/qcommon/cm_public.h
+++ b/src/qcommon/cm_public.h
@@ -41,6 +41,8 @@ qboolean	CM_AreasConnected( int area1, int area2 );
 
 int			CM_WriteAreaBits( byte *buffer, int area );
 
+mapversion_t	CM_MapVersion(const char *name);
+
 // cm_tag.c
 int			CM_LerpTag( orientation_t *tag,  clipHandle_t model, int startFrame, int endFrame,
 					 float frac, const char *tagName );
diff --git a/src/qcommon/common.cpp b/src/qcommon/common.cpp
index 465d26f6b..3a87f46dc 100644
--- a/src/qcommon/common.cpp
+++ b/src/qcommon/common.cpp
@@ -2453,6 +2453,7 @@ void Com_Init( char *commandLine ) {
 	// multiprotocol support
 	// startup will be UNDEFINED
 	MV_SetCurrentGameversion(VERSION_UNDEF);
+	MV_SetCurrentMapVersion(MAPVERSION_UNDEF);
 
 	// bk001129 - do this before anything else decides to push events
 	Com_InitPushEvent();
@@ -3051,6 +3052,27 @@ mvprotocol_t MV_GetCurrentProtocol() {
 	}
 }
 
+static mapversion_t mv_mapversion = MAPVERSION_UNDEF;
+
+void MV_SetCurrentMapVersion(mapversion_t version) {
+	mv_mapversion = version;
+}
+
+mapversion_t MV_GetCurrentMapVersion() {
+	return mv_mapversion;
+}
+
+const char *MV_GetMapVersionString(mapversion_t mapversion) {
+	switch(mapversion) {
+	case MAPVERSION_UNDEF: return "Unknown"; break;
+	case MAPVERSION_JK2:   return "JK2";     break;
+	case MAPVERSION_JKA:   return "JKA";     break;
+	}
+
+	assert(0);
+	return "";
+}
+
 // for auto-complete (copied from OpenJK)
 /*
 =============================================================================
diff --git a/src/qcommon/files.cpp b/src/qcommon/files.cpp
index c099c7b11..9a9fcfcce 100644
--- a/src/qcommon/files.cpp
+++ b/src/qcommon/files.cpp
@@ -199,7 +199,7 @@ enum {
 	PACKGVC_UNKNOWN = 0,
 	PACKGVC_1_02 = 1,
 	PACKGVC_1_03 = 2,
-	PACKGVC_1_04 = 4,
+	PACKGVC_1_04 = 4
 };
 
 typedef struct {
@@ -291,7 +291,7 @@ static const char	*fs_serverReferencedPakNames[MAX_SEARCH_PATHS];		// pk3 names
 char lastValidBase[MAX_OSPATH];
 char lastValidGame[MAX_OSPATH];
 
-qboolean FS_idPak(pack_t *pack);
+qboolean FS_idPak(const pack_t *pack);
 qboolean FS_IsInvalidWriteOSPath(const char *ospath);
 qboolean FS_ContainsInvalidCharacters( const char *filename );
 
@@ -340,7 +340,7 @@ qboolean FS_Initialized() {
 FS_PakIsPure
 =================
 */
-qboolean FS_PakIsPure( pack_t *pack ) {
+qboolean FS_PakIsPure( const pack_t *pack ) {
 	int i;
 
 	// actually, I created a bypass for sv_pure here but since jk2 is opensource I really don't see a point in supporting pure
@@ -1227,7 +1227,6 @@ int FS_PakReadFile(pack_t *pak, const char *filename, char *buffer, int bufferle
 	return 0;
 }
 
-
 /*
 ===========
 FS_FOpenFileRead
@@ -1322,7 +1321,8 @@ int FS_FOpenFileReadHash(const char *filename, fileHandle_t *file, qboolean uniq
 				!((search->pack->gvc & PACKGVC_1_02 && MV_GetCurrentGameversion() == VERSION_1_02) ||
 				  (search->pack->gvc & PACKGVC_1_03 && MV_GetCurrentGameversion() == VERSION_1_03) ||
 				  (search->pack->gvc & PACKGVC_1_04 && MV_GetCurrentGameversion() == VERSION_1_04) ||
-				  (Q_stricmp(search->pack->pakGamename, BASEGAME) && search->pack->gvc == PACKGVC_UNKNOWN) ||
+				  (search->pack->isJKA && MV_GetCurrentMapVersion() == MAPVERSION_JKA) ||
+				  (search->pack->gvc & PACKGVC_UNKNOWN && Q_stricmp(search->pack->pakGamename, BASEGAME)) ||
 				  (MV_GetCurrentGameversion() == VERSION_UNDEF))) {
 
 				// prevent loading unsupported qvm's
@@ -1330,7 +1330,7 @@ int FS_FOpenFileReadHash(const char *filename, fileHandle_t *file, qboolean uniq
 					continue;
 
 				// incompatible pk3
-				if (search->pack->gvc != PACKGVC_UNKNOWN && !FS_idPak(search->pack))
+				if (!(search->pack->gvc & PACKGVC_UNKNOWN) && !FS_idPak(search->pack))
 					continue;
 			}
 
@@ -2089,8 +2089,11 @@ static pack_t *FS_LoadZipFile( char *zipfile, const char *basename, qboolean ass
 		pack->gvc = PACKGVC_1_03;
 	} else if (!Q_stricmpn(basename, "o104_", 5)) {
 		pack->gvc = PACKGVC_1_04;
+	} else if (!Q_stricmpn(basename, "ojka_", 5) || !Q_stricmpn(basename, "dl_ojka_", 8)) {
+		pack->isJKA = qtrue;
 	}
 
+
 	// mv.info file in root directory of pk3 file
 	char cversion[128];
 	int cversionlen = FS_PakReadFile(pack, "mv.info", cversion, sizeof(cversion) - 1);
@@ -2113,6 +2116,10 @@ static pack_t *FS_LoadZipFile( char *zipfile, const char *basename, qboolean ass
 		if (Q_stristr(cversion, "compatible all")) {
 			pack->gvc = PACKGVC_1_02 | PACKGVC_1_03 | PACKGVC_1_04;
 		}
+
+		if (Q_stristr(cversion, "compatible jka")) {
+			pack->isJKA = qtrue;
+		}
 	}
 
 	// assets are hardcoded
@@ -2126,6 +2133,8 @@ static pack_t *FS_LoadZipFile( char *zipfile, const char *basename, qboolean ass
 		} else if (!Q_stricmp(pack->pakBasename, "assets5")) {
 			pack->gvc = PACKGVC_1_04;
 		}
+	} else {
+		pack->isJKA = qtrue;
 	}
 
 	return pack;
@@ -2252,11 +2261,12 @@ static const char **FS_ListFilteredFiles( const char *path, const char *extensio
 				!((search->pack->gvc & PACKGVC_1_02 && MV_GetCurrentGameversion() == VERSION_1_02) ||
 				 (search->pack->gvc & PACKGVC_1_03 && MV_GetCurrentGameversion() == VERSION_1_03) ||
 				 (search->pack->gvc & PACKGVC_1_04 && MV_GetCurrentGameversion() == VERSION_1_04) ||
-				 (Q_stricmp(search->pack->pakGamename, BASEGAME) && search->pack->gvc == PACKGVC_UNKNOWN) ||
+				 (search->pack->isJKA && MV_GetCurrentMapVersion() == MAPVERSION_JKA) ||
+				 (search->pack->gvc & PACKGVC_UNKNOWN && Q_stricmp(search->pack->pakGamename, BASEGAME)) ||
 				 (MV_GetCurrentGameversion() == VERSION_UNDEF))) {
 
 				// incompatible pk3
-				if (search->pack->gvc != PACKGVC_UNKNOWN && !FS_idPak(search->pack))
+				if (!(search->pack->gvc & PACKGVC_UNKNOWN) && !FS_idPak(search->pack))
 					continue;
 			}
 
@@ -2765,11 +2775,12 @@ void FS_Path_f( void ) {
 	Com_Printf ("Current search path:\n");
 	for (s = fs_searchpaths; s; s = s->next) {
 		if (s->pack) {
-			Com_Printf ("%s (%i files) [ %s%s%s%s]\n", s->pack->pakFilename, s->pack->numfiles,
+			Com_Printf ("%s (%i files) [ %s%s%s%s%s]\n", s->pack->pakFilename, s->pack->numfiles,
 				s->pack->gvc == PACKGVC_UNKNOWN ? "unknown " : "",
 				s->pack->gvc & PACKGVC_1_02 ? "1.02 " : "",
 				s->pack->gvc & PACKGVC_1_03 ? "1.03 " : "",
-				s->pack->gvc & PACKGVC_1_04 ? "1.04 " : "");
+				s->pack->gvc & PACKGVC_1_04 ? "1.04 " : "",
+				s->pack->isJKA ? "JKA " : "");
 
 			if ( fs_numServerPaks ) {
 				if ( !FS_PakIsPure(s->pack) ) {
@@ -3117,7 +3128,7 @@ qboolean FS_idPakPath(const char *pak, const char *base) {
 	return qfalse;
 }
 
-qboolean FS_idPak(pack_t *pak) {
+qboolean FS_idPak(const pack_t *pak) {
 	char path[MAX_OSPATH];
 	Com_sprintf(path, sizeof(path), "%s/%s", pak->pakGamename, pak->pakBasename);
 	
diff --git a/src/qcommon/qcommon.h b/src/qcommon/qcommon.h
index a0c468d20..3d13f5e0f 100644
--- a/src/qcommon/qcommon.h
+++ b/src/qcommon/qcommon.h
@@ -1056,9 +1056,18 @@ extern huffman_t clientHuffTables;
 #define	CL_ENCODE_START		12
 #define CL_DECODE_START		4
 
+typedef enum {
+	MAPVERSION_UNDEF,
+	MAPVERSION_JK2,
+	MAPVERSION_JKA
+} mapversion_t;
+
 void MV_SetCurrentGameversion(mvversion_t version);
 mvversion_t MV_GetCurrentGameversion();
 mvprotocol_t MV_GetCurrentProtocol();
+void MV_SetCurrentMapVersion(mapversion_t version);
+mapversion_t MV_GetCurrentMapVersion();
+const char *MV_GetMapVersionString(mapversion_t mapversion);
 
 #define	MAX_SUBMODELS			256
 
diff --git a/src/renderer/tr_image.cpp b/src/renderer/tr_image.cpp
index 1343567e3..01019e8b9 100644
--- a/src/renderer/tr_image.cpp
+++ b/src/renderer/tr_image.cpp
@@ -2645,7 +2645,11 @@ void R_SetColorMappings( void ) {
 	int		shift;
 
 	// setup the overbright lighting
-	tr.overbrightBits = r_overBrightBits->integer;
+	if (tr.mapversion == MAPVERSION_JKA) {
+		tr.overbrightBits = r_overBrightBitsJKA->integer;
+	} else {
+		tr.overbrightBits = r_overBrightBits->integer;
+	}
 
 	if (r_gammamethod->integer == GAMMA_NONE)
 	{
diff --git a/src/renderer/tr_init.cpp b/src/renderer/tr_init.cpp
index be85b3dc4..b14f6813e 100644
--- a/src/renderer/tr_init.cpp
+++ b/src/renderer/tr_init.cpp
@@ -145,6 +145,7 @@ cvar_t	*r_lodCurveError;
 cvar_t	*r_customaspect;
 
 cvar_t	*r_overBrightBits;
+cvar_t	*r_overBrightBitsJKA;
 
 cvar_t	*r_debugSurface;
 cvar_t	*r_simpleMipMaps;
@@ -1074,6 +1075,7 @@ void R_Register( void )
 	r_texturebits = ri.Cvar_Get("r_texturebits", "0", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
 	r_texturebitslm = ri.Cvar_Get("r_texturebitslm", "0", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
 	r_overBrightBits = ri.Cvar_Get("r_overBrightBits", "1", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
+	r_overBrightBitsJKA = ri.Cvar_Get("r_overBrightBitsJKA", "0", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
 	r_intensity = ri.Cvar_Get("r_intensity", "1", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
 	r_aspectratio = ri.Cvar_Get("r_aspectratio", "-1", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH); // screen resolutions
 	r_customaspect = ri.Cvar_Get("r_customaspect", "1", CVAR_ARCHIVE | CVAR_GLOBAL | CVAR_LATCH);
@@ -1230,7 +1232,7 @@ Ghoul2 Insert End
 R_Init
 ===============
 */
-void R_Init( void ) {
+void R_Init( mapversion_t mapversion ) {
 	int i;
 	byte *ptr;
 
@@ -1245,6 +1247,8 @@ void R_Init( void ) {
 
 //	Swap_Init();
 
+	tr.mapversion = mapversion;
+
 #ifndef DEDICATED
 	Com_Memset( tess.constantColor255, 255, sizeof( tess.constantColor255 ) );
 #endif
diff --git a/src/renderer/tr_local.h b/src/renderer/tr_local.h
index cd9e7d1b8..1e9323f97 100644
--- a/src/renderer/tr_local.h
+++ b/src/renderer/tr_local.h
@@ -1135,6 +1135,8 @@ typedef struct {
 	// gamma correction
 	GLuint gammaVertexShader, gammaPixelShader;
 	GLuint gammaLUTImage;
+
+	mapversion_t mapversion;
 } trGlobals_t;
 
 
@@ -1277,6 +1279,7 @@ extern	cvar_t	*r_skipBackEnd;
 extern	cvar_t	*r_ignoreGLErrors;
 
 extern	cvar_t	*r_overBrightBits;
+extern	cvar_t	*r_overBrightBitsJKA;
 
 extern	cvar_t	*r_debugSurface;
 extern	cvar_t	*r_simpleMipMaps;
@@ -1419,7 +1422,7 @@ qboolean	R_GetEntityToken( char *buffer, int size );
 
 model_t		*R_AllocModel( void );
 
-void		R_Init( void );
+void		R_Init( mapversion_t mapversion );
 void R_LoadImage( const char *name, byte **pic, int *width, int *height );
 image_t		*R_FindImageFile( const char *name, qboolean mipmap, qboolean allowPicmip, qboolean allowTC, int glWrapClampMode );
 image_t		*R_FindImageFileNew( const char *name, const upload_t *upload, int glWrapClampMode );
diff --git a/src/renderer/tr_model.cpp b/src/renderer/tr_model.cpp
index d5a2bf3bb..89d009791 100644
--- a/src/renderer/tr_model.cpp
+++ b/src/renderer/tr_model.cpp
@@ -1489,7 +1489,7 @@ static qboolean R_LoadMD4( model_t *mod, void *buffer, const char *mod_name, qbo
 */
 void RE_BeginRegistration( glconfig_t *glconfigOut ) {
 
-	R_Init();
+	R_Init(MV_GetCurrentMapVersion());
 
 	*glconfigOut = glConfig;
 
diff --git a/src/server/sv_init.cpp b/src/server/sv_init.cpp
index eb4c7e00e..f75291a5e 100644
--- a/src/server/sv_init.cpp
+++ b/src/server/sv_init.cpp
@@ -470,6 +470,10 @@ Ghoul2 Insert End
 	// clear the whole hunk because we're (re)loading the server
 	Hunk_Clear();
 
+	mapversion_t mapversion = CM_MapVersion(va("maps/%s.bsp", server));
+	MV_SetCurrentMapVersion(mapversion);
+	Com_Printf("mapversion set to %s\n", MV_GetMapVersionString(mapversion));
+
 /*
 Ghoul2 Insert Start
 */