Ive tried different ones and i agree they need to be cost effective, reliable and of course catch. The lights with replacable batteries all seem to be to large and expensive but did work well. Esspesially the multi colour which as i recal, never even made it to the bottom on its maiden drop before being inhaled by an unstoppable beast which claimed my whole rig. At the moment I use the Duralights or copies. There cheap, longlasting and catch. Custom networks in Oconnor sells them for $12 a piece but on line there much cheaper. I even spotted esca copies for $1 a piece today on ebay!

 I use the ebay ones mate a dollar or two posted n haven't had any drama with them yet. They have all worked and have made the trip up n down