LED 💡 light bulbs

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I got to thinking I guess these guys flash sixty times a second.     I thought about making a video with my phone then playing back slow and seeing if I could catch the on and off.

I tried to get it to flash 📸 with my signal generator but couldn't get any light 🚨 out of it.

Maybe the forward voltage ⚡ Vf is way higher than 20 Vp-p

 

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What would RULE is a variac that not only allowed adjustable voltage but adjustable frequency as well  now that would be killer   

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I got to thinking I guess these guys flash sixty times a second. 

The LED elements run on DC.  Under the plastic cover of the bulb is a circuit board with the electronics.

[joecool85]

I got to thinking I guess these guys flash sixty times a second. 

The LED elements run on DC.  Under the plastic cover of the bulb is a circuit board with the electronics.

Early LED bulbs didn't do a very good job with this and still flickered.  But yeah, current ones run on regulated DC with decent filtering for no visible flicker.  That said, dimmable LEDs are PWM (pulse width modulated) and are technically flickering all the time, just at a frequency WAY too fast for us to notice (on the order of several thousand times per second).