LDN - Luminis Developer Network

We are finally migrating to lum4 and I am trying to move our ldap sync scripts from lum3.  The delete user perl script compares external ldap accounts with luminis ldap and removes old user accounts if they do not exit in external ldap.   It is not working correctly and in fact wants to delete the groupstudiosystemuser, targetedannouncementsystemuser, and a newly created lumiintg user account.  Anyone know what I need to search on to exclude luminis accounts?  Does anyone have some generic ldap sync scripts posted somewhere for comparison and review?