You do save alot but im not sure about nicks numbers, To get an
incandesant to light when its output might be 1/ 100th or less I found
mine took 6-8v. I believe at 50% power you get less than 50% light
output. But incandesants can last 10 times more at 50% and nearly
indefinatly at 10% power, but this does not apply to halogens.