Is it, though? Most of the LEDs I've seen are very similar, and lower temp LEDs are slightly less efficient. If it were 60lm/watt I'd be a bit surprised, but 100lm seems pretty typical. Maybe not "well engineered", but average. (Which, with all due respect to the founder, seems the quality of the product.)
While 100lm/w is typical for domestic LED lighting, it's going to cause problems when the total power is several orders of magnitude higher but the form factor is approximately the same size. That heatsink will probably fry an egg, and I wonder about the lifetime of the diffuser plastic.