Anyone tried any drop in MR16 LED bulbs.

Specifically I found one called MR16 45 watt Cree LED Bulb at:
http://www.theledlight.com/dcbulbs.html

Specs include:
Base: GX5.3
LED: one 3 watt Cree Chip LED Cool White
Lumen: 115 lumen
Watt Consumption: 3 watts
View Angle: 25°
Color Temp: 6000K
Power: 12v DC or AC

$36.

Seems too good to be true.

SharpT