One possibility is that this lighting is only temporary and was put in place to satisfy FAA laws. Now that the crane is down there wouldn't have been any lighting in the airspace above the building. The only reason I say this is that if this was the finished product on the spire that it should also have a red aircraft warning light on the spire, but it doesn't have that yet. I'm also not sure this is the full height of the spire. It's supposed to be 144 feet tall.
Maybe AusTxDevelopment could take his whirly bird up for a closer look.