So far I have been using 200VAC input LED lamps for web cam photography. But there are 2 problems. First, rectangular shaped lamp shade is a bit bulky. Second it is not possible to adjust the light intensity.
So I am now experimenting with 12V DC 7.5W LED lamps. There is small, and intensity can be adjusted by changing the input voltage.
I found one more advantage of the DC powered LED lamp compared to the AC powered. That is there is no low frequency interference, so there are no horizontal dark band sweeping across the screen.
So I am removing the AC powered LED lamps and won't be using them for a long while.
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