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_15 (facility_id INTEGER, city_of_license VARCHAR, erp___power_w VARCHAR)

### Question ###
Which Facility ID has a City of license of springfield, ma, and a ERP / Power W smaller than 230?

### Accurate SQL ###

SELECT MAX(facility_id) FROM table_name_15 WHERE city_of_license = "springfield, ma" AND erp___power_w < 230