thanks ryansoh3 - the build by Cereal_killer is insane! LED ENGIN 365nm LZ1 in carbon fiber solarforce
Confusius - I would definitely go with Lithium rechargeables as the best time for amber-hunting is at fall and winter. And here in DK it can get pretty cold in the winter. As I understand it Lithium rechargeables are the ones who performs best in cold conditions.
What do you mean by “require more expensive equipment and care”? Because the chargers are more expensive? And what extra care. I wouldn’t want to blow my self up, so please inform 
At work we have some different battery powered Makita tools. The all run on Lithium-Ion batteries, and take a daily beating of moist, drops to the floor and so on. No explosions yet (knocking on wood …) :-p
Batteries, drop-ins, soldering, “circuit needs to be adjusted” … gasp!
The more I learn, the more overwhelming I think it seems.
Are there any sub-forums where I can request, or buy a custom build?
Also I’m very interested in learning if anyone inhere own, or has access to both a uv-light at around 365nm, and one below 365nm -to see the difference in luminescence from Amber under uv-light. I would happily send some small pieces of amber for someone to test.
oh -and as promised a photo of som amber illuminated with my cheap uv-lamp, in my high-tech darkroom (aka in bed under the quilt)
