One of these:
https://www.ebay.co.uk/.../7W-USB-LED.../113730044257...
Which I made into one of these:
http://www.steamtent.uk/assets/multimedia/LED-Lantern-540.mp4
Nice job there!
I bought a couple of the mains powered bulbs recently, took the oil holders out of a couple of bamboo garden lanterns and put a bulb fitting in. They look good in the garden when we sit out to cook on the barbecue or light the fire bowl.