How do you tell which version of a Surefire flashlight or weapon light?

Lefty Sig

Newly Enlightened
Joined
Jun 11, 2016
Messages
1
I have a Surefire E2DL defender and X300 - how can I tell which "version" they are? Neither is Ultra, but I'm not sure which lumen rating since both got "upgraded" over time without changing the model name. I've read in various posts that the "upgrades" were only rating changes, not not actual changes to the lights. But either way, I'd still like to know how to tell which version they are.
 

CelticCross74

Flashlight Enthusiast
Joined
Aug 30, 2014
Messages
4,021
Location
Fairfax Va
There should be a serial number on the light. Email Surefire CS with it and they should be able to tell you specifics.
 
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