When you use an LED lamp until it burns out, the energy consumption is less than 10 to 20% of the cost of running a halogen lamp at the same amount of time. This means a lot of savings on your electricity bills.
For every type of halogen lamp, there is a lower wattage equivalent in LED lights. So, you can easily swap out your old halogens for brighter and energy saving LED.
LED are much brighter these days than most halogen lamps. In fact, in a typical downlight, which consists of 20 halogen lamps, you can achieve the same amount of brightness using only 7 LED lamps. The lumen outputs of LED and metal halide can vary greatly at the same power consumption. For instance, a 400 watt LED gives out more-or-less the same brightness of a 1000 watt metal halide.