Others more knowledgeable than I will likely respond, but for the time being...
I'm not familiar with a Winelight II, but believe that all the winelights are SureFire E series flashlights, just in a beautiful wine red color. Do you have the one or two cell model?
You can get replacement lamps at the SureFire website or through a number of CPF dealers. Look for E1e or E2e replacement lamp modules (depends on which light you have). I believe Lumens Factory also makes brighter, E-series replacement lamp(s).
As far as LED goes, I'm not aware (but could very well be clueless) of any drop-in LED modules that will fit the standard head/bezel. The SureFire KL and/or KX LED heads should fit and work with the winelight body, but I am not aware of these heads being made in the wine color.
I trust that other members will chime in with more information and/or to correct my errors. Please be sure to confirm that these products will actually fit in your particular light before buying.