Quoted from Concretehardt:
Mine is the docquest projector (I think) and it does the same thing on my LE.
That's because the LE comes with the required node boards in the topper to activate my version of the signal interactively during game play.
If you want the signal to be interactive with gameplay and you have a premium game, you need the official Stern batsignal accessory since it comes with the required node boards.
My signal with a premium is configured to come on when ever the game is turned on. You could also wire it so it comes on with a flasher or insert or your choice. Unfortunately there isnt a single flasher or insert that comes on at all the same times as the Stern version with its node boards.