Try Bioquip for lights built for the purpose, they have corded, battery, and lights that use both. They'll definitely fit in a suitcase,
and try looking at Goal Zero for batteries you can transport. Just be prepared to spend the money to get things that work.
I've read a bit about using LED lights for moths, frankly, I don't see the purpose, unless it's simply for
energy usage. I think the results are still debatable. Nothing wrong with ebay, if you stick to a seller that knows what they're doing
and answers your questions.