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?
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?
- ...
- 23 posts total
Basically a switching power supply, akin to a USB charger, and about the same power level as well. I don't see anything about EnergyStar for these bulbs. If they were EnergyStar, they would have to meet some minimum power factor requirements that would normally mean less harmonics on the AC line. Since they don't appear to be, they could be poor (akin to those USB chargers). b_limo1,065 posts01-04-2020 12:01pmCan someone elaborate on smart light bulbs? I recently added 8, color changing, dimmable, smart led bulbs from sengled... |
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. |
audiozenology"That is a link to a highly technical article, that is itself really only applicable to one IC / control architecture. Most EEs would not understand the subtleties of it" It’s much more science-based, factual, and authoritative than sites such as wikpedia and it’s level of math is well within that which a real EE could understand it’s not fair to dismiss with "a wave of the hand" real science just because it might confuse some and even you perhaps! |
- 23 posts total