So I took my Fauser LiFli flicker detection device and went to a local IKEA store to measure the currently available bulbs in their lighting section. The vast majority of their lamps and bulbs flicker. However, some of them showed no sign of flicker on the device, which means the flicker must be below 1.5%*. So I bought those bulbs and took them home, measuring them with my oscilloscope setup. I tried to carefully measure even slightest fluctuations. Here are the results:
- IKEA LUNNOM LED 600lm 5.5W 2200K E27 [703.545.64]: ~30% 100 Hz flicker that goes down to steady 0.41% 100 Hz flicker within ~7 seconds, no measurable high frequencies
- IKEA LUNNOM LED 100lm 1W 2200K E27 [003.821.84]: borderline measurable 0.03% 50/100 Hz flicker (the 50 Hz part may be photodiode circuit noise), no measurable high frequencies
- IKEA LEDARE LED 600lm 7W 2700K E27 [903.887.75]: 1.24% 100 Hz flicker, decreasing over time down to 0.29% 100 Hz flicker after some minutes, 0.33% 80-100 (varying) kHz DC ripple
- IKEA LEDARE LED LED1719R6 400lm 5.3W 2700K E14 [503.658.27]: instant 0.18% 100 Hz flicker, no measurable high frequencies (total brightness decreases a little over time)
- IKEA LUNNOM LED LED1641C2 200lm 2W 2200K E14 [403.545.32]: instant 0.06% 100 Hz flicker, no measurable high frequencies
Those bulbs have E14 and E27 sockets. They are compatible with 50/60 Hz 220/240V~. They seem to be available in other EU countries' IKEA stores, too. Maybe for those countries who have a different power network, they share the same flicker characteristics world-wide.
I must see over time how those bulbs work for me. What's great so far is they don't make me feel sick after some minutes like other LED bulbs did. Plus currently I'm under the impression that truly flicker-free LEDs don't exist as long as they are powered by AC.
* (I adjusted the device to show flicker percentage as (A-B)/A, where "A-B" is the difference between highest and lowest amplitude, and A is highest amplitude. My oscilloscope results are also calculated with this method.)
Edit: Almost forgot, I took a photo of a GU10 LED that I didn't buy but was "flicker-free", too: