Incandescent light bulb heart shape with carbon filament tungsten. Bulbs are similar to the lamps of the past years and provide an excellent aesthetic effect and good visual comfort thanks to the warm light 2500K. Excellent durability +/- 2000 hours and input voltage 110-240V 50-60Hz. Bulbs are dimmable through common phase cutting regulators available for all series of civilian plates. The incandescent filament is an art, it is not only a lighting source. Highly recommended for restaurants, coffee shop, bedroom, shops, Valentine's day.