User blog comment:Lex wa Kaiho/What is Lumen Histoire?/@comment-6781178-20130513151420/@comment-7418318-20131004074055

Considering the color of the light, I think Igneel's a no-go. He'd produce a red or orange light with his flames.

If there's any Dragon in there Grandeeney or an unknown one would fit the color of the light better.