... E27, nickel coated copper 3, Plastic part: PTC Led negative ion air-purifying lamp1, Flicker free instant start, long life average ... 85% less energy than incandescent lamp;3, Releasing high density negative ions which is appropriate and good for healthy;4 ... health, food preservation and antibacterial, boosting the immune system and refreshing the air.5, Compact size, convenient installation, high ...