Hello
I asked the same question at Zacuto’s forum.
There rely;
“The light on the table is a Compact Florescent Lightbulb, or CFL. These lights flicker out of sync with the shutter, which is why some cameras flicker with it. The shutter speed was kept at 180 degrees or the closest available equivelent on all of the cameras.”
So…
And yes, it is a very good series – well worth watching. Apparently the next episode comes out on the 20th of July.