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Roger:
The "real" way to create flicker is with a flicker box, that electronically creates a fluctuating output to a fixture that duplicates the shifts in intensity that flame creates.
Barring that it is very possible to recreate this in a low-tech fashion by waggling things in front of the fixture, from strips of diffusion to one's own fingers. It depends how hard your light source is to begin with, a direct light will cause this method to appear as literal shadows (not good).
In reality, candles don't create that much of a flicker, if they are burning consistently (as the one in your test video is). It many instances it can be fine to forego the literal concept of building a fluctation into your lighting--it would have to be so subtle to not look "hokey" that it's almost not worth doing. Having the right "feel" to the lighting is more important, that a function of placement, quality and color.
The way I would light this scene would be to use a small unit with Chimera out of frame left and flag it off the candle and ribbon. This would create the appropriate lighting on the girl and allow the light to falll off on the back wall (most likely a separate flag would be used to cut down the amount of light on the wall vs the girl). I would also add a small unit directly above the candle pointing straight down with a bit of diffusion and a snoot to limit spill; this would pick up some detail in the ribbon (from the proper direction, above) and perhaps I would allow it to play a little on the girl's shoulder which would further enhance the proximity of the candle. Both units would get 1/2 CTO to match the candle. Depending on the mood of the scene, I might also add some very soft fill from the right, flagged off to avoid leaking on the back wall, and probably neutral in color (no gel) to give a little bit of contrast. If she was to look to her left (right side of the frame) this would allow her to have a touch of detail in the face and eyes as opposed to falling into complete blackness. Again this all depends on the scene and the overall style of the film--this is clearly a moody setup but for a comedy, a less literall approach and higher key look might be more appropriate.
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