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by copperx 2751 days ago
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.

1 comments

This makes me wonder what the dimmer might be doing