Here you can find the datasheet.
Here you can find the Luxeon Binning and labeling document.
"TXOH" tells us the Efficiency-Bin, the Color-Bin and the Vf-Bin.
T = 67.2-87-4 Lumens (presumeably @700mA) - @1000mA it would be 28% more
XO = 6700K
H = 3.03V-3.27V
Thats
29.36 - 41.21 Lumens per Watt @700mA and 25°C (in reality the LED will be warmer and a bit less efficient)
Lets compare that to some current Cree LEDs. To do this you can just use the
Cree PCT. It's really easy. Which emitter you use depends on what kind of beam you want. Smaller hotspot, more throw and a bit less lumens oder wider hotspot, less throw and even more lumens.
If you want maximum efficiency and a wide, floody beam you should use the new Cree XP-L. Compared to the more well known XM-L2 it's a little bit more efficient. If you want more throw either the smaller XP-G2 oder the even smaller XP-E2 will make more sense. They should yield a more comparable beam to the luxeon since the XP-L has a larger DIE.
Here is a comparison with all LEDs @700mA and 25°C and each in the best Bin currently available:
| Vf | Lumens | Lumens/Watt |
XP-L V6 | 2.97V | 381 | 183 |
XP-G2 S3 | 3.04V | 323.4 | 152 |
XP-E2 R4 | 3.19V | 260 | 116.4 |
Now remember, even though the smaller LEDs are less efficient, they are running much closer to their specified maximum current ratings. They will produce more throw.
Compared to the old Luxeon LEDs you can alos get the new LEDs in much nicer tints and even with higher CRI rating (those are a bit less efficient though). You can also de-dome them to get 90% more Lux at the same current with the same reflector/optic. This is basically ten years! of technical evolution. It's definitely worth it to put in one of these.