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Lots of good advice but one question - have you tried LED bulbs before and had flickering problems?
Just worth checking a standard LED from your local super market before you go down the route of expensive brands or online purchases.
The reason I say this is that there are a lot of shoddy cheap and counterfeit electronics sold on Amazon for example. A supermarket bought bulb meanwhile actually has some quality control and standards plus you have somewhere you can go back to should you need to return them.
All my LEDs are from my local supermarket, own brand (Tesco, I'm in the UK, but Philips are also available for me) and I've had no issues. I'd also buy from local retailers where you can get good returns policies (Argos here, or your big box retailers in the US)
Amazon meanwhile has a policy of mixing stock that it purchases with stock from small sellers that they place in their warehouses and sending any to a customer. So a "sold by amazon" item may actually be a counterfeit item supplied by a 3rd party. Basically do not buy anything of value or branded from Amazon. So don't buy Phillips or other brands from Amazon.
And definitely do not buy the cheap Chinese unknown brands on amaxpn or elsewhere. The supermarkets will of course be buying Chinese made bulbs for their own labels but they will be buying them in bulk from specific factories and under contracts with some quality expectations, unlike the shitty free for all small seller type sourcing that your get from Amazon. Small sellers are going to be buying cheap ass unbranded bulbs and the factories are going to sell their cheapest bulbs plus ones that's do not meet bulk orders quality control thresholds via this route (cheaper to dump the bulbs by selling cheaply instead of having taking the financial hit and binning them). A large supermarket has leverage over the factories to maintain quality (or lose the contract) while small sellers have none.
Personally the only time I had a flickering LED bulb was a dimmer-switch lamp; it was designed for LEDs but didn't work with the bulb I bought but turned out I'd accidentally bought a non dimmable bulb. Otherwise I've not had a single bulb flicker in my house including all ceiling lights and numerous lamps. All my bulbs are supermarket own brand.
Most of the ones that I see installed in stores have that problem. My workplace put in led and I come home with eye strain. The ones I bought at menards have had the same problem.
My big problem is that I don't visually see flicker but rather if I move my hand in front of my face I see a shutter effect. Which I'm assuming is because the refresh rate of the bulb is to slow.
It's not a "refresh rate" really. LED's are Light Emitting Diodes, and a diode is an electrical component that only allows electricity to flow in one direction. So an LED only works when electricity is flowing in one direction. Houses run on AC current (Alternating Current) with a frequency of 60Hz in the US. So if you plugged in normal AC into the LEDs, it would be off half the time, flickering 60 times a second. The LED light bulbs should have built in components that convert the AC signal into a constant DC signal. If you get normal bulbs that are well made, there should be absolutely no flicker.
Are you using a lot of computer screens at work? Because using computer screens can cause eye strain, and also cause you to blink less resulting in your eyes drying out. Both of those can cause headaches. If you do use a lot of computer screens, you should consider getting eye heat compress (my ophthalmologist recommended me this one). You should also be able to get normal store bought LED bulbs that do no flicker. Perhaps try the slightly more expensive name brand options if the store brand isn't working for you.