"Lunker Lights" are the small flexible tubes that are Phosphorescent when you activate them. I only see the small ones in Green. Larger ones used for Shark fishing come in Pink, Amber, Red, Blue, and White as well as the Green.
Take a thick drinking straw (like Burger King uses) and cut it into 1/4 inch lenghts with a scissor. Put two on your line before you tie on the swivel. The straw slices will hold the Lunker Light at each end, and you want it fairly close to the swivel. Alternatively, you can wrap a rubber band around it and your line, and activate it once you are ready to fish.
YES! A flasher hanging off the swivel will indeed increase your catch. The herring are copycats, and the flash looks like a fish feeding. That gives you an idea of the size flasher you want. Double and triple headers are the norm, rather than unusual events.
Flounder