I just received my first AT (Doberman XP-L) . . . NO WAY that this light puts out 1200 lumens!
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There wasn't a manual, either?!
Assuming you have the Dobermann XP-L HI "White" version (due to mentioned green overtones...) Armytek clearly states in the specs that the Out-the-Front lumens is 1050 for that light. This is likely correct... I have the Dobermann Pro in XP-L HI White (rated at 1200 LED / 1000 OTF lumens) & it's significantly brighter with one high-drain 18650 than my 760 - 820 lumen Nitecore SRT-7 as can clearly be seen in the photo I posted 4 posts up. These can also be used with two RCR123's for 8.4V operation which should give maximum brightness in trade-off for reduced runtime.
As for the manual, download it from the product page.