The Netbook of Witches and Warlocks
By Timothy S. Brannan and The Netbook of Witches and Warlocks Team
Full netbook can be found on the followng website
A Lunar or Solar weapon is a special weapon whose enhancement increases or decreases during the time of day. A Lunar weapon deals additional 1d6 points of magical energy during the night, while a solar weapon deals 1d6 magical energy during the day.