6) use any of the above methods but with UV leds and coat the glass on your bulb with phosphor, giving some extra buffer to the flicker by way of a slow brightness decay.
I'm fairly sure the IKEA bulbs use the above method. If you turn them off they have an afterglow for a couple seconds.
I'm fairly sure the IKEA bulbs use the above method. If you turn them off they have an afterglow for a couple seconds.