diff --git a/command_watcher.sh b/command_watcher.sh
index 27874cc..068db1e 100755
--- a/command_watcher.sh
+++ b/command_watcher.sh
@@ -3,11 +3,11 @@
 COMMAND_FILE=/tmp/command
 
 lounge_light() {
-	./light.sh $1
+	./light.sh 1 "$1"
 }
 
 lounge_light_toggle() {
-	./light.sh
+	./light.sh 1
 }
 
 cd "$(dirname $0)"
diff --git a/light.sh b/light.sh
index 59ffe84..a2e3dbc 100755
--- a/light.sh
+++ b/light.sh
@@ -1,15 +1,75 @@
 #!/bin/bash
 
-TMPFILE=/tmp/light_state
-touch $TMPFILE
-LIGHT_STATE=$(cat $TMPFILE)
+TMPFILE_BASE=/tmp/light_state
+ROOM_NUMBER="$1"
+COLOR="$2"
+
+ROOM_COUNT=3
+STATE_0="a\x00\x03\x00\x00\x00|000000000000000000;\
+	000000000000000000;\
+	000000000000000000"
+STATE_1="a\x00\x03\xff\xff\xff|255255255255255255;\
+	000000000000000000;\
+	000000000000000000"
+STATE_2="n\x00\x02\x01\x00|170000070150000050;\
+	000000000000000000;\
+	000000000000000000"
+
+get_room_color_string() {
+case "$ROOM_NUMBER" in
+	1)
+	  COLOR_A="$(echo "$COLOR" | sed "s/\(..\)\(..\)\(..\)/\\\x\2\\\x\1\\\x\3/g")"
+	  COLOR_B="$(echo "$COLOR" | while read -N2 code; do printf "%03d" $((16#$code)); done)"
+	  echo "a\x00\x03$COLOR_A|$COLOR_B$COLOR_B"
+	  ;;
+	2)
+	  echo ""
+	  ;;
+	3)
+	  echo ""
+	  ;;
+	*)
+	  echo "ERROR: wrong room number, internal problem detected" >&1
+	  exit 1
+	  ;;
+esac
+}
+
+set_room_color() {
+case "$ROOM_NUMBER" in
+	1)
+	  echo -en "$(echo "$STATE" | cut -d";" -f1 | cut -d"|" -f1)" > /dev/udp/172.23.92.15/49152 &
+	  echo -en "$(echo "$STATE" | cut -d";" -f1 | cut -d"|" -f2)" > /dev/udp/172.23.92.16/31302 &
+	  ;;
+	2)
+	  # echo -en "$(echo "$STATE" | cut -d";" -f2 | cut -d"|" -f1)" > /dev/null
+	  # echo -en "$(echo "$STATE" | cut -d";" -f2 | cut -d"|" -f2)" > /dev/null 
+	  echo "not implemented" >&1
+	  exit 1
+	  ;;
+	3)
+	  # echo -en "$(echo "$STATE" | cut -d";" -f3 | cut -d"|" -f1)" > /dev/null
+	  # echo -en "$(echo "$STATE" | cut -d";" -f3 | cut -d"|" -f2)" > /dev/null
+	  echo "not implemented" >&1
+	  exit 1
+	  ;;
+	*)
+	  echo "ERROR: wrong room number, internal problem detected" >&1
+	  exit 1
+	  ;;
+esac
+}
+
+if ! [[ "$ROOM_NUMBER" =~ ^[0-9]+$ ]] || ! [ "$ROOM_NUMBER" -gt 0 -a "$ROOM_NUMBER" -le "$ROOM_COUNT" ]; then
+	echo "ERROR: please specify a valid room number" >&1
+	exit 1
+fi
+
+touch "${TMPFILE_BASE}_$ROOM_NUMBER"
+LIGHT_STATE=$(cat "${TMPFILE_BASE}_$ROOM_NUMBER")
 [ -z "$LIGHT_STATE" ] && LIGHT_STATE=0
 
-if [ -z "$1" ]; then
-	STATE_0="a\x00\x03\x00\x00\x00;000000000000000000"
-	STATE_1="a\x00\x03\xff\xff\xff;255255255255255255"
-	STATE_2="n\x00\x02\x01\x00;170000070150000050"
-
+if [ -z "$COLOR" ]; then
 	LIGHT_STATE=$(( $LIGHT_STATE+1 ))
 	case $LIGHT_STATE in
 		0)
@@ -27,16 +87,12 @@ if [ -z "$1" ]; then
 		  ;;
 	esac
 else
-	COLOR_A="$(echo $1 | sed "s/\(..\)\(..\)\(..\)/\\\x\2\\\x\1\\\x\3/g")"
-	COLOR_B="$(echo $1 | while read -N2 code; do printf "%03d" $((16#$code)); done)"
-	STATE="a\x00\x03$COLOR_A;$COLOR_B$COLOR_B"
+	STATE="$(get_room_color_string)"
 fi
 
 for i in {1..5}; do
-	echo -en "$(echo "$STATE" | cut -d";" -f1)" > /dev/udp/172.23.92.15/49152 &
-	echo -en "$(echo "$STATE" | cut -d";" -f2)" > /dev/udp/172.23.92.16/31302 &
-
+	set_room_color
 	sleep .01
 done
 
-echo $LIGHT_STATE > $TMPFILE
+echo $LIGHT_STATE > "${TMPFILE_BASE}_$ROOM_NUMBER"