The XP-E2 is limited to only 2.4A .
See this two wonderful threads on the T20 modding : Uniquefire UF-T20 mod: 3.05A xpg2-3C dedomed on Sinkpad
and There is no substantial gain in throw going from dedomed XP-G2 to dedomed XP-E2
The two lights are very different because of the size.