There’s a qualitative, not just a quantatiative, difference between direct sunlight and reflected moonlight - and between reflected earthlight and the other two. Some frequencies get emphasized or suppressed, as spectographs show. Thus they have different effects on us real-life humans, let alone on fictional vampires and werewolves.
(Uh, not wishing to be pedantic here, just giving the only answer I can think of to the last two wonderful comments…)
There’s a qualitative, not just a quantatiative, difference between direct sunlight and reflected moonlight - and between reflected earthlight and the other two. Some frequencies get emphasized or suppressed, as spectographs show. Thus they have different effects on us real-life humans, let alone on fictional vampires and werewolves.
(Uh, not wishing to be pedantic here, just giving the only answer I can think of to the last two wonderful comments…)