I often hear people saying that an MR16 bulb uses less electricity than a 120V reflector bulb. In truth, a 50W MR16 bulb uses as much power as a standard 50W reflector bulb. The difference is that it gives you close to 100W worth of illumination for 50W worth of power consumption. But there is also the issue of lamp life: low voltage bulbs compared to line voltage bulbs. A standard household bulb lasts 750 hours, while a standard reflector bulb lasts 2,000 hours, and a standard MR16 lasts 6,000 hours. Note that this is what is called average rated lamp life, which essentially means that at the rated life, such as 750 hours for a household bulb, half of the lamps would be burned out at the 750-hour mark and half would last longer than 750 hours.