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_20297668_1 ( yarn_type__us_ VARCHAR, standard_yarn_weight_system VARCHAR )

### Question ###
Name the yarn type for standard yarn weight system for 3 or light

### Accurate SQL ###

SELECT yarn_type__us_ FROM table_20297668_1 WHERE standard_yarn_weight_system = "3 or Light"