This shouldn't be in the .info file. When you download the zip it has this and the 7.x-1.0-beta

; Information added by drupal.org packaging script on 2010-09-24
version = "7.x-dev"
core = "7.x"
project = "lightbox2"

http://drupalcode.org/project/lightbox2.git/blob_plain/refs/heads/7.x-1....
.info files:
http://drupal.org/node/542202