I believe they are referring to LED filament bulbs, which are designed to look like traditional filaments but have the benefit of separating the LEDs from the e

I believe they are referring to LED filament bulbs, which are designed to look like traditional filaments but have the benefit of separating the LEDs from the electronics. More here: https://en.wikipedia.org/wiki/LED_filament https://en.wikipedia.org/wiki/LED_filament