I have been using these lamps for a few weeks now. I initially connected them to 120V AC, but with good batteries they last a long time too - many days of filming real estate video clips on a green screen. The ability to change color temperature and brightness provides more flexibility in video production. For example, a silly clip I did with a cow pasture at sunset required me to match my own subject lighting in front of a green screen with the evening lighting of the background video I was using. See Figure 2.
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