gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
160207-2212 EST
Throughout the day I have played with three or four bulbs.
By tonight the Feit is not as bad as early today. Appears to be temperature sensitive. At one point after being off for a long time there was no about 1000 kHz oscilation. After being on for a while it starts to grow.
Following are several plots from the Rigol scope. One major vertical division is 0.2 A, horizontal is 2 mS per major divison.
Feit:
Tonight the Feit oscillation is smaller and moved up to about 1100 kHz
Cree:
Note: the Cree current is very close to a sine wave and in phase with the voltage.
25 W incandescent:
.
My point about the YouTube video was that it tends to imply that all LED bulbs are major harmonic sources. Our government is trying to require equipment to have reduced harmonic content in the load current. There is good reason for this when you see the considerable peak voltage waveform distortion. We need the existing power distribution system to be able to handle an increased power load without having to unnecessarily build additional lines.
And also the video time domain current waveforms did not look correct for what one would expect.
.
Throughout the day I have played with three or four bulbs.
By tonight the Feit is not as bad as early today. Appears to be temperature sensitive. At one point after being off for a long time there was no about 1000 kHz oscilation. After being on for a while it starts to grow.
Following are several plots from the Rigol scope. One major vertical division is 0.2 A, horizontal is 2 mS per major divison.
Feit:
Tonight the Feit oscillation is smaller and moved up to about 1100 kHz
Cree:
Note: the Cree current is very close to a sine wave and in phase with the voltage.
25 W incandescent:
.
My point about the YouTube video was that it tends to imply that all LED bulbs are major harmonic sources. Our government is trying to require equipment to have reduced harmonic content in the load current. There is good reason for this when you see the considerable peak voltage waveform distortion. We need the existing power distribution system to be able to handle an increased power load without having to unnecessarily build additional lines.
And also the video time domain current waveforms did not look correct for what one would expect.
.
