[A Nazi holds Vibe at gunpoint.]
Overgirl: This is very simple. With his powers, the Reich can open breaches all across the Multiverse. We will raise the Nazi Flag over infinite earths. Stand down, and we'll spare yours. Think of your family, think of your friends.
The Ray: I am thinking of them! And they want me to tell you to go to Hell!
Overgirl: Does't sound all that unpleasant. (01:02:30)
Cisco Ramon: What's your plan when you get there?
Ray Terrill: Find other members of the Resistance before I get killed by Super Nazis.
Cisco Ramon: Good plan. (00:56:20)
Cisco Ramon: If what's going down on Nazi Earth is as serious as you say, you shouldn't be heading over there without backup.
Ray Terrill: I can't let anyone else get hurt because of me, Cisco.
Cisco Ramon: Does that include Barry killing me when he finds out I let you do this alone?
Ray Terrill: You don't have to tell him.
Cisco Ramon: Fair point... I have to say it, it might sound weird... But I can't believe I'm missing out on Nazi Earth.
Ray Terrill: Cisco, you're seriously the only person who wants to visit Nazi Earth...
Cisco Ramon: Yeah, that's probably true. (00:55:40)
Cisco Ramon: So you want me to send you to an Earth overrun by Nazis, including a Nazi Supergirl?
Ray Terill: Uh... yeah.
Cisco Ramon: My life is sooo weird sometimes. (00:55:25)
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