Amazing energy saving and long life from these LED bulbs. Rated at just 2w and up to 50,000 hours, they could last as long as 25 conventional halogen bulbs. Please bear in mind that these bulbs have a whiter light and are not as bright as halogen spot lights, with an equivalent light output of 10w. However, with 18 bright white longlife LEDs they should not need replacement for years of normal use, and of course you can carry on using your existing light fittings.