E2DL output runtime compared to LX2 runtime?

[KDOG3]

I'm wondering if the output runtime graph for the E2DL fares better than the LX2 since the E2DLs' head doesn't seem as "heavy" and would probably disapate heat a little better. Would anyone know?

 

[Niconical]

I'm no expert, but if the E2DL head is lighter, wouldn't that mean that the heavier LX2 head would actually dissipate the heat better due to the greater amount of metal to "soak up" the heat from the LED?

 

[KDOG3]

I was thinking the lighter head would vent the heat to the air quicker. But I'm not sure...