I got a 3 pack of *14* LED flashlights with batteries at Costco. I can count the veins in my green eggs and see very well into the darkest BCMs. These flashlights have 2 settings, bright & blind.
I made collars for the tops out of a strip of aluminum sandwiched in packing tape. Take the packing tape, lay it down sticky side up, then the aluminum, then another layer of tape. Wrap the light with it, shiny side in, and tape it so it fits snugly. You'll need to make sure that the foil goes to the edge so that no light escapes the top or bottom.
This collar is flexible and fits the egg no matter how you turn it, and it directs all of the light through the egg, not your hand, so you get a better beam.