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Small cheap set that had them in pairs
Anytime that a sentry 'is' Ultron, the eyes turn red. When he 'goes' elsewhere, the sentry turns back to blue. In the final scene w/Vision the eyes are red.
(There's a scene where Ultron gets the vibranium and says 'this is going well' and then the sentry's eyes go back to red.)
Of course acknowledging that Ultron controled all of the sentrys.