1. Features and uses: - Small in size, good in light transmission. The filament is specially treated and not easy to break. 2. It is suitable for various low - voltage crystal lamps, chandeliers, and spotlights. 3. The power must be disconnected when installing or replacing. 4. The temperature of the lamp bead is relatively high when it is lit. Do not touch flammable items or touch it with your hands to avoid burns. Q: What do JC and JCD mean? A: JC means safe low voltage, and JCD means dangerous high voltage. Q: What do G4, G5.3, and G6.35 mean? A: G indicates that the lamp base type is plug - in, and the following numbers represent the distance from the center of the lamp hole (in millimeters “MM”). Q: What do MR11, MR16, and GU mean? A: MR: Multiple reflections (lamp shade). The following numbers represent the diameter of the lamp shade (1/8 inch). The diameter of MR16 = 16×1/8 = 2 inches ≈ 50 millimeters, and the diameter of MR11 = 11×1/8 ≈ 35 millimeters. GU: G indicates that the lamp base type is insert - type, U indicates that the lamp base is U - shaped, and this number represents the distance from the center of the lamp hole (in millimeters “MM”).