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I get the $30 set and they easily last 4-5 years. My last set was still good after 8 years when I sold the rig. Corrosion usually happens at the bulb socket and the ground wire connection. I grease the sockets with dielectric grease. The ground wire gets a waterproof connection (stops the water from wicking up the wire).
Also, I never disconnect the lights when launching. That never made sense to me. I think it was a carryover from when the actual bulb and socket would be submersed in salt water.
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