is this that thing on TV? I remember it being something like a light, right?

a crappie light is a crappie light. If you want a green are blue light you can use a marker on your regular white bulb a lot cheaper than buying the "secret weapon" There are also a lot less expensive model for sale that are the exact same thing. The light attracts the plankton which attracts the bait fish which attracts the fish youre after