Thermal resistances:
LG H35F0: 2.5°C/W
Cree XP-L: 2.2°C/W
Cree XP-L2: 2.2°C/W
Cree XP-G3: 3°C/W
Nichia 219C: 4.2°C/W
Cree XM-L2: 2.5°C/W (but with much bigger footprint)
So they are all very similar in that regard. The XP-L2 tolerates a much higher maximum current though because of the flipchip design.
Brightness @ 3A (LG doesn’t state the temperature, I assume 25°C):
LG H35F0 4000K: 882lm
Cree XP-L2 U6 4000K: 1000lm
Nichia 219C D240 4000K: 800lm
Cree XP-G3 R3 4000K: 910lm
So the XP-L2 is indeed noticeably more efficient (13% more lumens, basically two Cree Bins). Even the XP-G3 is brighter.
The LG LED still has some benefits though:
- cheaper and easier to get compared to the XP-L2 90CRI (Mouser is very expensive for low quantities)
- larger Die size compared to Nichia 219C and XP-G3 => more useful Beam in some lights
Does anybody have the datasheet of the LG LED?