LED's

Hey guys I know that a number of you have some LED lights in your cars and I was wondering if the LED burn hotter or cooler than the standard bulbs. I had to get a new driver's side headlamp assembly and the first one I got the amber lens in the thing melted because the bulb got so hot. I have some 36 LED 3157s on the way and I am hoping that those will be the solution. Any input or ideas guys?