Q" allows individual access to:
· Top Secret Restricted Data · Top Secret Formerly Restricted Data · Top Secret National Security Information · Secret Restricted Data · Special Nuclear Material (Category I & II) · Exclusion Area Access

"L" allows individual access to:
· Confidential Restricted Data · Confidential Formerly Restricted Data · Special Nuclear Material (Category III) · Confidential National Security Information · Unescorted Access to Limited and Protected Area · Secret Formerly Restricted Data · Secret National Security Information

а также:

Personnel who possess an L clearance and whom the Security Office has briefed can enter and work within the Limited Area, pursuant to particular access limitations, without
an escort. Authorized levels of classified information include Restricted
Data at the Confidential Level and National Security Information through
the Secret Level.