I bought two packs of 6 and burned out most of the twelve bulbs in 3 months. I average 180 hours per bulb, but some bulbs burn out after 120 hours. I went on eBay and bought GE MR11 12v 20w halogen landscape lights for a little more than these lights and they are all burning bright after 3 months. The expensive MR11 lights purchased from Home Depot are 7 months old and working.