I found an albino.

[Steveo]

I've noticed that T + and T - albinos I've kept avoid bright light. Some more than others and as to the reason, I can only speculate. Regardless of the individual preferences of the snakes themselves, exposure to UV without the melanin can eventually cause blindness and/or cancer so an albino in the wild wouldn't be expected to live to a ripe old age I would imagine.

On the behavioral side, a snake doesn't know that it's albino or what being an albino means. Hiding from bright lights (more than non-albinos) is either a genetically-driven behavior that evolved over time in carriers of the albino gene, or a physical response to stimulus (light) that is only elicited in snakes that lack dark pigments.

And on the matter of T+/T-, it's very similar to the difference between diabetes types 1 and 2 - one type can produce insulin but won't respond to it properly, whereas the other cannot produce insulin in sufficient quantities (or at all).