Creates complex light animations which would be laborious to do by hand. Lightning - flickering lights - fluorescent lights turning on - strobe lights - pulses of light. This does it all.
Extensive info can be found here regarding script details
Spookylights animates the multiplier value of lights to create animation. With a little thought - this can create numerous effects that would be really tedious to create manually. Here's some examples: Lightning - flickering candle - police car lights - intermittent faults - fluorescent tube turning on - strobe lights - landing strip patterns - that thing where a sign has synchronised flashing lights around it - those freaky flashing lights in alien and many others