Quote Originally Posted by Morty View Post
Damage from sunlight will depend on your Humanity and Blood Potency now. Vampires with high Humanity and low Blood Potency will be able to spend some time in the sun, although it's still painful and restrictive. As Humanity decreases and Blood Potency increases, it'll become more lethal. We don't know the numbers yet.

As for why it's a Humanity sin to spend time in the sun - the reasoning given by one of the devs is that even if thou can survive it thanks to your high Humanity, it still hurts, burns and hinders you. Walking around in the sun reminds you that you're an outcast who doesn't belong there every moment.
As long as they don't sparkle.