Well I just got started with the night fishing for crappie this summer. I was reading all the posts in here about everyone catching the crappie at night and decided to give it a try. I purchased a Coleman Northstar Propane lantern and build a lantern holder out of PVC pipes and hang that lantern on the back of my boat. That provides lots of light so that I can see and by putting the lantern in the back of the boat it keeps the bugs away from me as I sit in the front of the boat. I also purchased one of those green fluorescent lights that runs on 12v dc current. I put a cigarette lighter type electric plug on the end so that I could plug that light into my boat's cigarette lighters. I have a cigarette lighter on the front deck up by the trolling motor platform and one at the steering console. So I can use the lantern at either end of the boat. I also have a 12v dc power pack that can run the lights and save my trolling motor and cranking batteries for other uses like starting the boat to get back home at the end of the night.
The portable 12v dc power supply is also used to jump start another car, truck or boat when their batteries are drained down. It also had a light and built in jumper cables in the unit. I use that for cleaning fish as I can attach a 12v dc powered electric filet knife to the power plug outlet. The other light that I purchased was the quartz like starfire II that is very bright. It does attract a lot of minnows and shad. I have not really used any of these lights that much yet. I also tried to fish with jigs only at night and don't recommend that. I should have used live bait and anchored in one spot. I tried to just hover in one spot one night but the light breeze kept my boat moving and I had to use the trolling motor to put the boat back in position. I suspect that by moving the boat so much I scared away any fish that where attracted to the lights ohter than the shad. I was fishing at night by myself most of the time. I didn't stay out all night but only fished until about midnight then called it quites. My only crappie that I caught after dark came from the bank one night when I first got my colemen lantern. I just put the lantern along the boat ramp's edge and set out a slip bobber rig. I caught one crappie about 30ft out from the end of the boat ramp.
Setting up in the right spot is important and using the right bait can make or break the night fishing trip.
I would say that the starfire II quartz light was the best but remember that it takes more amp to run than those fluorescent green lights. You can run the green light all night long on a small battery pack but the quartz light will drain a battery faster. So like the ohters said make sure that you have a spare battery. I have three batteries. One for the trolling motor (deep cycle blue top marine optima battery) one for starting the boat's gasoline motor ) Blue Top Optima Marine Cranking Battery) and a VECTOR Jump"n Charger Smart 12v Battery Charger and Jump-Start System. The latter can charge your other batteriese at 2/4 or 6amp charge rate. And there is 450 amps engine start. Veco128 is the model number I think. You can hook up an extention cord to the unit and charge up it's internal battery. With the extension cord attached it can be used to charge other batteries as well. I use the heck out of this new battery Jump'n Charge system. I use the 12volt outlet to supply power to my filet knife. I used it this summer to run my quartz underwater fishing lights. I can put this battery anywhere in the boat and that is nice. I carry it in the cab of my truck as a security blanket and to take it fishing with me where ever I go.
Next summer I hope to find some good spots to night fish.
Don't forget the deet bug spray and don't get any bug spray on your plastic tackle boxes tops. It will ruin the clear plastic and spot the plastic where you can't see though the plastic as easily as before. I made that mistake last summer on night when I sprayed myself and got the overspray all over my brand new Plano Tackle Box's clear plastic top. That was a bad move on my part.
My final answer is the starfire Quartz Underwater light with the 10ft cord that attaches to a battery. It's bright and portable and the only problem with it is that it gets very hot and will only work when under water. You have to turn the light off and leave it in the water for several minutes to cool down the light. If you take the light out of the water before it's cooled down you can ruin the light and destroy the light bulb. You never want to give power to the light when it's not under the water or it will overheat and be lost.