The glowing cable does function without the dock. According to iPhone5Mod, the cable supports iTunes and data sync, so this isn’t a dumb charging cable. The whole package is called–quite originally–the Flash Lightning Dock. The demand has crashed iPhone5Mod’s website, but they’ve also dropped the price for the dock from $60 to $40, which isn’t a terrible price. While the cable alone is $20, which is the same price as Apple’s official option, this one lights up. And it portends manufacturers making cheap charging cables, unless Apple’s lawyers get involved and try to extract a licensing fee.
The dock is currently on sale from iPhone5Mod, but the traffic has borked their site. Their Twitter will tell you when its back up.