So, I've got some code that stores the same documents in a Lucene 3.5.0 index and a Solr 3.5.0 instance. It's only five documents.
For a particular field, the Solr norm is always 0.625, while the Lucene norm is .5. I've watched the code in NormsWriterPerField in both cases. In Solr we've got .577, in naked Lucene it's .5. I tried to check for boosts, and I don't see any non-1.0 document or field boosts. The Solr field is: <field name="bt_rni_NameHRK_encodedName" type="text_ws" indexed="true" stored="true" multiValued="false" />