You kinda said it yourself..

>He tends to be darker when he feels concealed and is away from the heat source.

When they are away from the heat source, they get darker,
I notice this in all of my boas.

> He is usually light when he's out and about

that's beacuse he is plenty warm and happy (as I'm sure
you've noticed they are more active when nice and warm)

I know you said you didn't think it's because of the heat,
but IMO it really is, yes he's light phase when in the heat
box but that is because he is nice and warm, he wouldn't
be darker when in the heat because he isn't trying so hard
to absorb it. I know I do not always explain things very
well but hopefully that makes sense.

Good observations tho! I always enjoy seeing my
boas in their diff. 'phases' of course half the time they
are onthe cool side and in the dark-phase I want to go in
there scoop them up and say "if you're cold go over to
the other side!" lol

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