No, I don't think that's correct. ORM is one way to implement DAO; you can choose to do DAO without ORM.
You've got it backwards: I'd consider ORM to be heavier than DAO, because the dependencies are greater. I can write a DAO in straight JDBC without ORM. That's lighter, IMO.
Whether or not we agree depends on how we define "light" and "heavy". I'm going by dependencies - the number of extra JARs required over above the JDK itself.
