A T3, in healthy condition, should stomp all over an X5. My T3 has no problems throwing a white beam 150 feet+. Something an X5 shouldn't be able to do at all. If you've tried 2 diffrent sets of lithium batteries in the T3 and it's no good, perhaps the T3 is faulty ?
T3 is a great light (quality, cost, output and beam wise) and comes with a limited lifetime warranty with Inova. Apparently, Inova are pretty good with warranty claims.
If you have a lux meter, perhaps you can measure the lux of the X5 and T3 for some number comparison. A T3 should be around 2000lux give or take, an X5...hrmm, maybe 100 give or take.
Might want to keep your photos limited to 800 width (not trying to be smart/patronising).
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