Hi,
Some of the ideas that have been posted here have been done in the past and in very poor fashion. Leds have been built into fishing rods at the tip end of fishing rods. Nite Glow Rods is a company that did this and they are out of business now because of the poor quality and engineering put into their product.
I have heard of a fishing rod that has been developed on the coast of Oregon that the tip section illuminates when a fish takes the bait. These rods need to have a pretty stout bite in order to illuminate them from what I hear. These rods, I have a feeling will never make it into full scale production as they have a lot of parts and I doubt they could be built to be very reliable. I am pretty sure that a mercury switch is used in the construction of the rods and I just not see how they could be built to be very durable.
Another illuminated fishing rod that has been produced used fiber optics inside an opaque fishing rod illuminated by a flashlight in the handle of the rod. These were another that failed because of poor manufacturing. The flashlights would only illuminate for about 6 to 8 hours maximum and they were cheaply built as well. A lot of your larger AAA batteries would get stuck in these flashlights because the anodizing would have drips inside the battery cylinders. If these people would have paid more attention to quality and would have been up on the leds they may have still been in business today.
As for the flexible tube type neon gadgets out there that have been mentioned. They have a power pack that is stationary and is not a really a part of the fishing rod. The weight of this product desensitizes the fishing rod but they do look neat. The weight of this product will effect the action of the fishing rod while casting as well. Rod blank engineering is an exacting science and this product has not been taken into account when rod blanks are designed. I believe an effort has been made to incorporate this product into the fishing rod itself but the need for voltage and the weight it would create bar this from ever being a viable fishing rod or product for a manufacture to ever consider building.
I have built an illuminated fishing rod that has won an award for best recreational product of 2001 from Hammacher Schlemmer a 154-year-old company. Hammacher Schlemmer has had some involvement with products such as the pop up toast and electric hair dryer in the past and at the time these products were considered to be gadgets or novelty items. The fishing rods I have developed will illuminate over 48 hours with the use of two AAA batteries and they indicate when a fish has taken the bait as well. I use a laser mounted in the handle of the fishing rod that projects the beam into the interior of the fishing rods hollow tubular construction. Either the laser light can be reflected off the inner walls of the rod blank for more illumination or can be pointed directly at the tip of the fishing rod for greater sensitivity in the bite indication. I now have a wide variety of sizes and strengths these fishing rods can be built in covering everything from ocean to freshwater fishing. I am moving into my last phase of development at this time and I am not sure if I am going to be able to make it work because of the manufacturer that licensed my product but that is a long story and we are just talking about lighted fishing rods here so I will leave this as is. Check your search engine for (laser fishing rods or
www.wylierods.com) and you will see what I have done with fishing rods. I wouldn't say this if it weren't true; I have built the best-illuminated fishing rods that has ever been built.