Pilsner DME (or Extra-light DME) uses Pilsner malt as its base malt. Light DME uses pale malt as its base. Pilsner is lighter in color and tastes a little different - not a huge difference, though. Methinks it's more appropriate for the style of beer you are brewing than the light DME.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Primary: Saison, Berliner Weisse, sLambic I, sLambic II, IPA, 70/-
Secondary: Orange Blossom Mead, Flanders Red I
Kegged: Fat Man Porter w/ 1469, Fat Man Porter w/ 005, Centennial Falcon w/ Conan, Centennial Falcon w/ Denny's, Barrel-aged Fat Man Porter, Belgian Dark Strong, Dark Mild