From experienced anglers, squid are definitely attracted to artificial lights at night. JT, an experienced angler from New Zealand has this to say from Black Magic Tackle: "Some years ago they took the lights away from the sea side of Tamaki Drive in Auckland, to make way for more pedestrian room.  This made an immediate effect on squid fishing with the numbers caught dropping significantly" There is also a very interesting scientific experiment conducted in 1999 by Prince of Songkla University in Malaysia.  "From the results of the experiments, it could be postulated that both big fin reef squid and mitre squid are strong phototaxis animals that are easily attracted by artificial light." They also found that squid are not sensitive to the color of the light and respond the same to all light colors.