The lamps I got had a “flicker-free” mark on their packaging, so you might want to find some with that.

Another solution probanly is to go to a hardware store and try each 3000k lamp into the testing plug they have (they tend do have such). Open your phone, turn on the camera, get it close to the lamp and see if you can see any difference in flickering (the store lamps will probably flicker already, so just see if the tested lamp adds any extra flicker).