Wilma Upgrade: for Wilma lights with switch on the cable
Cree XML2 U4 Upgrade
Wilma Upgrade: for Wilma lights with external switch (on the cable.)
The upgrade can be done by yourself! There is no need to return your light to your dealer or Lupine. Depending on your light version, the additional amount of Lumens can be different; but always at least an additional 500 Lumens.