What constitutes a level 3 or higher danger level with psad?

What constitutes a level 3 or higher danger level with psad?

So far I have only got notices for 1 and 2:
Danger level: [2] (out of 5)

From the psad configuration file:

### Danger levels. These represent the total number of ### packets required for a scan to reach each danger level. ### A scan may also reach a danger level if the scan trips ### a signature or if the scanning ip is listed in ### auto_ips so a danger level is automatically ### assigned. DANGER_LEVEL1 5; ### Number of packets. DANGER_LEVEL2 15; DANGER_LEVEL3 150; DANGER_LEVEL4 1500; DANGER_LEVEL5 10000;

Thanks!

I am going to lower the number for 3 and set the email notifications for 3 or higher.