The white hallway was a bright white when the lights were on but not all of them were on. As soon as they walked a certain distance another light turned on while the ones behind them turned off. Which meant they were motion sensitive.
That could also mean the alarms could be motion sensitive and they could have already set them off. There was a good chance that whatever occupants were here were aware of their presence.
The first room they arrived at had a clear blindspot when he was looking at the hologram so he would know what that spot was now. But as they entered the pitch black room the door slammed behind them. The lights did not turn on which kept them in the dark.
