NBC's "The Wall" - lit up balls

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Does anyone know for sure how the balls are lit up on NBC’s “The Wall” game show? GOOG search doesn’t seem to be finding any answers to my curiosity question.

I have two schools of thought:

  1. the balls are painted in something that fluoresces red or green depending on what wavelength light is shined on them (or the wall as a whole)

  2. there is a LED, power pack, and maybe also even a wireless receiver in each ball that you can command the ball to light up a red or green LED inside the ball, but I think the mass of the electronics and battery inside the ball would have to affect the bounce of the ball (or any access hatch to put the items in the ball would also have to affect how it bounces if the access seam was to hit a peg).