said by aurgathor:With 12 VDC, they could use 3 - 4 LEDs in series and a small resistor.
They could; I've never seen that in a commercial product, though.
I have some very cheap offshore import MR16 LED lamps, and even they have switching regulators in them. I can get IC LED driver boards from China for less than 50 cents each, even in small quantities, so cost isn't really that much of an issue.