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Old 01-21-13, 08:09 AM   #1
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Cree T6 v. U2?

I can get a single T6 or U2 LED set with handlebar mount, head strap, battery, recharger, and battery case for about US$29 here in Taiwan.
What's the difference between the two? Experiences with either or both? Which one do you/ would you prefer? Why?
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Old 01-21-13, 08:11 AM   #2
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If I remember right, the U2 is the newer and more efficient XML, about 5-10% more light output for the same battery usage compared to the XML T6.
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Old 01-21-13, 12:35 PM   #3
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That sounds about right. You don't see too many U2 based lights out there yet, but I bought one from Keygos, and it came with everything the OP lists.
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Old 01-21-13, 01:07 PM   #4
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The U2 is more efficient than the T6. Most U2 light I have does have it's good or bad depending on how you look at it. It has to do with the tint. U2 light I used are usually white and sometime even drift toward the blue cold spetrum. For many folks that may not matter so much, but for those who prefer warm as in somewhat toward the yellow color than a T6 maybe a better choice that is assuming you know what the T6 light package is using for the LED in terms of the tint.

That can be good or bad. Some T6 XML light I got was too warm for what I wanted while others may have a little bit of greenish tint and I think thats from the reflector setup more so than it is from the tint selection. The U2 seem to me like they are more consistent where the tint is simply either white or ever so a slight hint of blue but not so much that it is really that noticable. That being said, I had more color variation from vendor with XML T6 light simply because they don't list the tint of the LED they are using.
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Old 01-21-13, 06:41 PM   #5
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The XM-L2 is out on the market now.
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Old 01-22-13, 07:55 PM   #6
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I have XM-L emitters in T6, U2 and U3 varieties in my different lights. It would seem that how they're driven and the reflector used make a lot more difference than the emitter. I sometimes wonder how many lights sold as U2 are actually T6 (can't tell by looking and most don't have the equipment to measure the difference).
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