Troubleshooting LED refresh rate or flicker
Well in the UK, the first of your videos is called strobing the second is flickering. My own (non clinical) tests show that dimmable light bulbs (even when not on dimmers) and both halogen and LED seem to do eiter flickering or strobing to varying degrees, some bulbs more so than others, even when on simple on off switches. I don't know if it's bad for you though, but I would rather not find out long term, so I have tested many bulbs dimmable and not and found a few bulbs which don't strobe or flicker at all, not even a small flicker, even at iphone slow motion record of 240. Unfortunately, they are all higher-end NON dimmable Led bulbs. Must be the technology used on dimmable bulbs that allow some movement within the bulb. I have not yet found even 1 dimmable bulbs of any shape or size or make that does not at least flicker to some degree (even on on/off switches) when viewed in slow motion record. Thats why I dont use any dimmers at home which is a shame but if you ever find a dimmable bulb that doesn't flicker, I would love to know :)