Here is what Coleman has from their newsroom. The lumens they list are less than has been reported on this site. Note there is a misprint on the northstar saying it is a 2 mantle and it is a single. This document is dated 1/16/12. The link is below.
NorthStar® Dual Fuel™ InstaStart™ Lantern:
Mantle: Two mantle design uses No. 95 Insta-Clip® mantles (included)
Lumens: Up to 1138 lumens on high
Run Time: Up to 7 hours on high on one tank of fuel
Features: Battery InstaStart™ Ignition for fast, matchless lighting (includes one AAA battery)
Fuel Capacity: 2.0 pints
Model No: 3000000944
Premium Powerhouse® Dual Fuel™ Lantern (295 Series):
Powerhouse® Technology: Burns 25% brighter than 285 series lanterns
Mantle: Two mantle design uses No. 21 Insta-Clip® mantles (included)
Lumens: Up to 1107 lumens on high
Run Time: Up to 7 hours on high on one tank of fuel
Features: Lights easily with matches. Filter funnel included.
Fuel Capacity: 2.0 pints
Model No: 3000000946
Premium Dual Fuel™ Lantern (285 Series):
Mantle: Two mantle design uses No. 21 Insta-Clip® mantles (included)
Lumens: Up to 861 lumens on high
Run Time: Up to 7 hours on high on one tank of fuel
Features: Lights easily with matches. Filter funnel included.
Fuel Capacity: 1.3 pints
Model No: 3000000923
http://news.coleman.com/pr/col/dual-fuel-lanterns-221913.aspx