hello and thanks for your fast answer.
This is what appears on the screen
pi@raspberrypi:~ $ node-red-start
Once Node-RED has started, point a browser at http://192.168.1.118:1880
On Pi Node-RED works better with the Firefox or Chrome browser
Use node-red-stop to stop Node-RED
Use node-red-start to start Node-RED again
Use node-red-log to view the recent log output
Use sudo systemctl enable nodered.service to autostart Node-RED at every boot
Use sudo systemctl disable nodered.service to disable autostart on boot
To find more nodes and example flows - go to http://flows.nodered.org
Starting as a systemd service.
Started Node-RED graphical event wiring tool.
7 Nov 23:42:36 - [info]
Welcome to Node-RED
7 Nov 23:42:36 - [info] Node-RED version: v0.19.5
7 Nov 23:42:36 - [info] Node.js version: v8.12.0
7 Nov 23:42:36 - [info] Linux 4.14.71-v7+ arm LE
7 Nov 23:42:37 - [info] Loading palette nodes
7 Nov 23:42:43 - [info] Dashboard version 2.10.1 started at /ui
7 Nov 23:42:44 - [info] Settings file : /home/pi/.node-red/settings.js
7 Nov 23:42:44 - [info] Context store : 'default' [module=memory]
7 Nov 23:42:44 - [info] User directory : /home/pi/.node-red
7 Nov 23:42:44 - [warn] Projects disabled : editorTheme.projects.enabled=false
7 Nov 23:42:44 - [info] Flows file : /home/pi/.node-red/flows_raspberrypi.json
7 Nov 23:42:44 - [info] Server now running at http://127.0.0.1:1880/
7 Nov 23:42:44 - [warn]
Your flow credentials file is encrypted using a system-generated key.
If the system-generated key is lost for any reason, your credentials
file will not be recoverable, you will have to delete it and re-enter
You should set your own key using the 'credentialSecret' option in
your settings file. Node-RED will then re-encrypt your credentials
file using your chosen key the next time you deploy a change.
7 Nov 23:42:44 - [info] Starting flows
7 Nov 23:42:44 - [info] Started flows
pi : TTY=unknown ; PWD=/home/pi ; USER=root ; COMMAND=/usr/bin/python -u /home/pi/.node-red/node_modules/node-red-node-pi-sense-hat/sensehat.py
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root