Blinded by the Night edit 2. btrudo,Christophersea, milo

[milo]

brightly is not necessarily correct - rage in this case is what is called a linking verb - essentially a glorified form of the verb "to be".

the fire burned red
the sun shone yellow
etc . . .

Poets can decide upon such usage, but it's not considered acceptable grammar. Not that I care much about the rules of grammar, but they exist and change. As for glorified "to be", 'rage' in the poem doesn't read like an is. There is are differences between rage brightly and rage bright, and I believe that I already discussed my take on that. I have no problem with "rage bright", but I want did want to offer my different reads on the word choice.

If you want as an is, why didn't the poem say:
who chose the bright suns we hoped would rage forever

The little choices do give different connotations.

If you're just doing it to make the meter tidy, is that good enough of a reason?

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the difference is obvious -

the suns would rage bright = the suns would /be/ bright with a little passion thrown in.

the suns would rage brightly is a rediculous statement. What is the difference between raging brightly and raging dimly? Besides being a stupid thing to say it sounds terrible. I would leave it as it is.

grammatically they are both correct.

just my input.