> It also uses about half the power of the LED bulb it replaced.

This may or may not be the only thing in play for that much of a difference, but my absolute favorite thing about LEDs is that their power consumption vs brightness is not 1:1, so taking an LED to 50% brightness will use <50% power. (So then doubling the number of LEDs means you will always get more brightness or less power or I suppose both if you split the difference.)