In the Green Lantern comic books, members of the Green Lantern Corps fight cosmic injustice with a power ring, the most powerful weapon in the universe. The ring's power is only bounded by the imagination and willpower of the wearer. A power ring can generate green, solid-light constructs created from the wearer's mind.
The light effect over this replica Green Lantern ring was created by twirling a small flashlight with a green filter.
Submitted to the Flickr group 7 Days of Shooting.