The UExx is for the E-Series such as the E2e, E2D, L4 etc.
Note that the E2D is the incandescent version.
The E2DL is the LED version. It's important to include the "L" rather than "LED" separately so as to avoid confusion.
Also be aware that the E2DL utilises a dual output User Interface whereby the user clicks the flashlight off and on again to toggle between the low and high output modes.
Momentary switching using the remote tape pressure switch will also toggle between the two modes. Also, the influence of weapons recoil can be enough to break the circuit and toggle the output change (although some have found carefully stretching the spring contact can help avoid this).
Still, the E2DL bezel is dual output and not ideally suited to use on a weapon. SureFire offers the KX2C bezel for the same high output and beam - it's a single mode light - high output and is the bezel used by the M600C ScoutLight.
Al