Please if you're going to argue about this then think through the consequences of what you say! If it's power is not constant and so depends on its speed then that means absolute speed is a thing and BAM there goes the rest of relativity.
What? Light has constant speed and doesn't violate relativity. We don't know how or why it does, but we posit that it does, so how would something else having a similar effect be invalid?
Maybe you should actually read more about modern physics.