20. No stage of the authorised development shall commence until written details of any external lighting to be installed—
(a)temporarily at any of the construction sites within that stage during the construction phase; or
(b)permanently during the operational phase at any site within that stage,
including measures to prevent light spillage, have, after consultation with the highway authority, been submitted to and approved by the relevant planning authority; and any approved means of lighting must subsequently be installed and retained for the duration of the construction phase and operational phase as approved.