Cree XML vs XML2, Shazam we all like higher effeciency and better CRI but its Lumens we need

Cree XML vs XML2

XM-L
The XM-L first became available in December 2010. It is a 5 mm*5 mm LED with a die size of 2 mm*2 mm. (4mm2) It is one of the larger LEDs that Cree makes and can be identified the 6 strips in a grid across it.
It has 7 brightness bins ranging from T2 to U3. They are: T2, T3, T4, T5, T6, U2, and U3.
Bin   700mA   1000mA    1500mA    3000mA
T2    200-220   275-303       390-429       650-715
T3    220-240   303-330      429-468        715-780
T4    240-260   330-358      468-507        780-845
T5    260-280   358-385      507-546        845-910
T6    280-300   385-413      546-585        910-975
U2    300-320   413-440      585-624        975-1040
U3     320-340   440-468      624-663       1040-1105
Note: These are emitter lumens. OTF lumens once it is installed in a flashlight will be less. 
 
The XM-L is generally used in lights that run on Li-ion batteries due to it needing large amounts of current. It is used in a number of throwers due to its large output.
Note: This graph is measured when the junction temperature is 25 degrees Celsius. When used in a flashlight it will be at a higher temperature so this data is only approximate. 
This graph shows that the XM-L needs between 2.5 volts and 3.4 volts to operate.
The XM-L can handle up to 4.4 amps in this instance before it reaches the point of diminishing return. Due to the extremely large amount of heat that is being generated here a large heatsink with adequate surface area is a must.
The XM-L can be found in a number of different tints, which is covered very thoroughly in this thread.
Datasheet is here.
The XM-L can be bought most anywhere, but as usual I will recommend Intl-Outdoor.
http://www.intl-outdoor.com/led-xml-c-107_125.html
XM-L2
The XM-L2 is the successor to the XM-L, it first became available in December 2012. Like the XM-L it is a 5 mm*5 mm LED with a die size of 2 mm*2 mm. (4mm2) Unlike the XM-L it does not have a grid on the die.
It has 9 brightness bins ranging from S4 to U2. They are: S4, S5, S6, T2, T3, T4, T5, T6, and U2.
Bin   700mA       1000mA     1500mA     3000mA
S4    186-196    256-268    360-377    612-641
S5    196-207    268-284    377-400    641-679
S6    207-227    284-313    400-439    679-746
T2    227-250    313-343    439-483    746-820
T3    250-273    343-375    483-528    820-895
T4    273-296    375-406    528-571    895-970
T5    296-318    406-438    571-615    970-1044
T6    318-341    438-468    615-659    1044-1119
U2    341-364    468-500    659-703    1119-1193
Note: These are emitter lumens. OTF lumens once it is installed in a flashlight will be less. 
Note2: I took this data from FlashlightWiki so it was multiplied by 13% to account for them being binned at higher temperatures than XP-Gs. If you do not understand this ignore it. 
 
To date the XM-L2 has not been used in any lights. Vinhnguyen is taking preorders for a XM-L2 P60 drop in but they have not been produced yet. However, one could expect them to be used in the same lights as XM-Ls once they have fully entered the market.
This graph shows that the XM-L2 needs between 2.7 and 3.4 volts to operate.
Since the XM-L2 is extremely new there is no lumen testing that has been done on it. For that reason I have created a graph based on the approximate lumen values supplied in the datasheet. I assumed it was a XM-L2 U2. Obviously, this graph does not tell us anything new.
So far the XM-L2 can only be bought in NW or CW. The advantage is that a NW T6 XM-L2 is equal to a NW U3 XM-L. As there never was a NW U2, let alone a U3 this is a huge advantage.
The datasheet can be found here.
So far they only can be purchased from Mouser. As time passes they will most likely be available from more sources.

About Busy Bee

Northern Michigan
This entry was posted in High Bay Led Lights, LED, Led Lights 2013, led spectrums, LED UPDATES and tagged , , , . Bookmark the permalink.

One Response to Cree XML vs XML2, Shazam we all like higher effeciency and better CRI but its Lumens we need

  1. Thank you, nice post! This was the thing I needed.

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