Why are my brand new, daylight led bulbs flickering?
Keep in mind that the LED bulbs made with Edison bases have the electronics in the base.  They produce heat.  Many fixtures out there mount the lamps upside down.  So the heat concentrates in the base and overheats the electronics.  Try one of those brand of bulbs that starts flickering in a table lamp (BEFORE it starts flickering of course) where the bulb is mounted in free air, right side up.  I will bet it won't start flickering.
Electronic parts are manufactured to run at different temperature levels.  Lower temp electronics are cheaper.  While Ed is right about the certification, even certified LED bulbs will run with a far longer lifetime if the bulb has good air circulation and heat dissipation and is oriented so the heat doesn't concentrate around the driver.  My preference would be that LED bulbs were certified in both &quot;right-side-up-only&quot; applications and &quot;universal&quot; applications. as the &quot;right-side-up-only&quot; ones would be cheaper and would allow the discerning consumer to save money.  Unfortunately too many consumers are ignorant and that scheme likely would not work out so well.