These bulbs are recommended by Nick Pineault (The EMF Guy). They emit low EMFs and they don’t flicker. I can vouch for them emitting low EMFs (about the same as the halogen bulbs I used to have). I can’t tell if they flicker, but I trust Nick Pineault’s judgement.
They’ve got 3 settings which emit varying amounts of blue light for morning, afternoon and evening. It’s easy to switch between the settings – you just press the light switch.
I don’t know how long they last as I’ve only had mine a few weeks. At £28 each, they’re not cheap, but they seem to be improving the quality of my sleep so I think they’re worth it for me.
They’re sold by Block Blue Light, a company which has a distributor in the UK. Here’s a link to the page:
https://www.blockbluelight.co.uk/collections/sleep-enhancing-lighting/products/full-spectrum-light-bulb