The other answers have nothing to do with lighting.

An access control model defines a computer and/or network system's rules for user access to information resources. Access control models provide confidentiality, integrity and also provide accountability through audit trails. An audit trail documents the access of an object by a subject with a record of what operations were performed. Operations include: read, write, execute and own. Non-Discretionary Access Control is usually role-based, centrally administered with authorization decisions based on the roles individuals have within an organization (e.g. bank teller, loan officer, etc. in a banking model). A system's security administrator grants and/or revokes system privileges based on a user's role. This model works well for corporations with a large turnover of personnel.

HTTP is Port 80.
Reference: MAIWALD, Eric, Network Security: A Beginner's Guide, McGraw-Hill/Osborne
Media, 2001, page 135.