The panelists had to work out which renewable energy source was powering the bulb.

https://www.youtube.com/watch?v=NAMuWsVNg9Q

It shouldn’t really matter which direction the panel faces for a lightbulb. That looks like a 200w panel and bulbs are like 13w so even in shadow you’ll probably have enough power from ambient light.

I have two of those portable fold-up panels. That one looks more like 75w or 100w at most (both of mine are 100w and are a bit larger than that one). When shaded, it's like maybe 10watts.

Even if it is technically enough, I'm mostly commenting on the fact that it's facing away from the sun (those fold-up ones definitely aren't bi-facial).

Now that I think about it, it probably was facing the sun/east when the production crew set it up but that part was filmed late in the day.

Alex says each device has been running all day to charge a battery. It would probably still have picked up enough charge even if it were facing down.