This week this bulb did burned out and brought another bulb to be replaced. During the replacement, somehow I must have it forced to push the bulb and the cork and the envelope gotten loose. I managed to separate the wire from the bulb and the cap. I had to use the plier to unscrew the cap. I managed to put the new one in okay. Here is the result of my snafu. My finding did reveal that it has metal disc to reflect heat from the exhaust tube stem. This bulb I used it from one of General Electric Soft White Indoor Spotlight