The redstone lamp starts blinking if it is setup like this.
Too many of theese may crash your game (or server) because the chunk loading system can't keep up.
I dont know how this works. If someone does. Tell me
Setup on picture below
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There's more to that setup to that may need to get looked at. The pulsing the lamp does, only happens when the system is open to the air. If you enclose it in stone or dirt or ice and water (vintagebeef) the light won't pulse.