The LED's are not cast in silicone but protected by hard PVC. In the size of the bulb about 1 cm longer and the base is low more than a halogen bulb Mitel. In my Ceramiclampholder it has yet (although just above) fitted. Highlighting I want the luminosity corresponding without compromising a 40 W halogen lamp. Since I operate the LED in a chandelier right next to other 5 lights, I must also praise the luminescent color. Finally, a warm white, which makes the name. The typical difference between LED lighting and halogen, in spite of the distance of the present in my chandelier lamps of only about 20 cm from each other not recognizable!