[akronate]

Former product display engineer here. Many of those light bulb displays are only meant to demonstrate color temperature, and have completely different power systems on board then an actual light bulb. Usually the AC rectification will be removed and replaced with a DC/DC converter.

This is mostly so that the display can be battery powered, because the availability of AC power on shelf is pretty hit or miss. I wouldn’t trust a display to indicate if the bulb has flicker or not.

[copperx]

The ones you're talking about demonstrate color temperature. The ones I've seen demonstrate the different light output of different brands and are connected to AC through a dimmer. You can play with the dimmer, and the price of the dimmer (each dimmer is different) and the bulb are displayed.

I can't imagine those are battery powered or that every different bulb on display has been modified.

[fenwick67]

This makes me wonder what the dimmer might be doing