If they are fully feathered and it is not to chilly at night you shouldn't need any light at all. It being dark at night is perfectly natural for them :)
That is not a brahma unfortunately, because of the single comb, wrong coloration, and absence of feathered feet. It also appears to be a cockerel (rooster) incase you were unaware. If you want a better chance at breed guessing I suggest you wait until he is full grown. Then repost with clear...
Riana shook the sand off her wings. A quick glance around led to the conclusion that she was in what appeared to be a cave. Further inspection revealed no exits or entrances. Where am I? How did I get here? And better question... how do I get out?
Hmmmmm... And what if I accidentally started a civil war among the outcasts? Then stopped it and now they are after the dragons? That wouldn't ruin anything, right?