The worst part of LEDs is they have a noticable 60 cycle flicker that is less noticable on flourescents. An LED is a one way device so when the power cycles to negative voltage the LED turns off. Incandescents would have the same flicker but the filament cannot cool down enough during the cycle to be noticable plus they work during the negative voltage part of the cycle. Take an LED christmas light or clock into a dark room. Move it up and down in a wide arc and you can see the flicker easily. Some people are more suceptible to the flicker, like my wife and two of the kids than others. LEDs run on DC do not flicker.
As a side note the filament in the Flourescents is only part of the startup cycle. I'm recalling that from memory so don't quote me on it.
I heard that neon lights use even less electricity than Flourescents and LEDs for the same light output.
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