Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_2 (extra_points INTEGER, player VARCHAR, points VARCHAR)

### Question ###
Which Extra points is the highest one that has a Player of herrnstein, and Points smaller than 30?

### Accurate SQL ###

SELECT MAX(extra_points) FROM table_name_2 WHERE player = "herrnstein" AND points < 30