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THD In Light Bulbs

I have replaced a 40w incandescent light bulb with a 12w LED light bulb. The new LED is way brighter. In fact, the box says that it's a 75w equivalent. The box also shows something interesting:

Power Factor >.90  
THD: <35%

I've read that LEDs are essentially diodes. How does this affect noise in the mains? Do LEDs inject more, less, or the same amount of THD into the mains as incandescent/fluorescent lights? 
c_avila1

Showing 1 response by erik_squires

erik_squires
15,640 posts
 
Depends on the light. I've heard and measured on a scope what compact fluorescent light bulbs do an AC line and they are horrible.

Others have reported issues with dimmable LED's. The traditional wall dimmer is also a potential noise source.

I try to keep everything that switches outside of my clean power zone. This includes network routers, etc.
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