Revealing mistake: When The Ray lands on the ground regrouping with the other Freedom Fighters, there is a bridge behind him with many civilians walking in the background. The animators took an obvious shortcut here as the civilians in the background just consist of the sprites of about 5-7 different people just repeated over and over again all in their same poses on each copy as they move. One especially noticeable one is a kid walking in an olive gray shirt with his arms up right next to himself over and over again. (00:01:45)
Answer: My understanding is the Ray uses pure light for his powers while Superman and Supergirl get their power from the solar energy of a yellow sun, not yellow light.
Bishop73
I see. But if it was from pure light, wouldn't his powers have a white glow and not a yellow glow?
Quantom X ★
Most likely just a styling choice. I just know the basics details of his powers and not sure why it comes out yellow (or if it's even stated.) Perhaps for the the same reason the sun appears yellow, short wavelength light becomes scattered.
Bishop73