Accurate Measurements on pulsed system's harder than you think.

[seychelles]

Works out to be the same a joule thief, because of dc pulsing visually more lumens
  when you connect the cap the pulse is filtered dc voltage  and current is higher but
the lamp show less light because there is no pulsing..light illusion . BUT a circuit diagram
will get me out of the bush..

[seychelles]

AGAIN A LITTLE BIT OF THAT WHITE'S MAN MAGIC STUFF..

[tinman]

Works out to be the same a joule thief, because of dc pulsing visually more lumens
  when you connect the cap the pulse is filtered dc voltage  and current is higher but
. BUT a circuit diagram
will get me out of the bush..

First ,we are using an incandescent bulb-not an LED.

the lamp show less light because there is no pulsing..light illusion

yes,your eyes can be fooled with LED's,but incandescent bulbs do not work that way.
What if we use a solar panel to measure light output--can a solar panel be fooled like your eyes can?
So we shall see.

[centraflow]

The resistance R of the bulb will change as it heats up. Raising V will cause I to increase, creating heat which will change R untill it reaches it's stable temperature


My 2p worth


Regards


Mike

[verpies]

In this thread,i will show you that using a CVR and scope will not always lead to accurate measurements. I mentioned some time back,that using resistors(CVR's) dose not always give accurate result's,and in some system's your scope could be leading you up the garden path.

Yes, an inductive CVR can lead you up the garden path.
Non-inductive CSRs (CVRs) do not lead up the garden path.

OK,here is the first video,and i am off to make the second.
https://www.youtube.com/watch?v=QfqvIjABXZ8

In this video you seem to be using a wirewound CVR that is inductive.

Also, the light bulb has a coiled filament which makes it inductive - maybe that amount of inductance does not matter at these frequencies but it will at higher ones.
I recommend automotive dome light bulbs with straight filament, which are not inductive and are much better candidates for power measurement via optical coupling to the photovoltaic cell.

P.S.
Could you draw a schematic of your setup?  It can be on a sheet of paper or a mouse-scrach in MS-Paint.
It is hard to follow even that amount of wires from the video ...especially at high zoom.