Board Thread:Questions and Answers Forum/@comment-94.13.63.251-20141123202254/@comment-25250760-20141123204054

Yes.

From Vault of Glass, second paragraph at the top:

"While players can run the raid as many times as they want each week, moving about through various raid groups in order to assist their fellow Guardians with these difficult encounters, they will only be able to receive loot from the raid once per week per difficulty setting, due to a weekly raid lock.[1] "