Yes and for example in central europe, you won't get enough UV-B from the sun in the winter months at all, as it is filtered out by the atmosphere (low angle, m

Yes and for example in central europe, you won't get enough UV-B from the sun in the winter months at all, as it is filtered out by the atmosphere (low angle, more atmosphere to pass through). But in the sommer, one still should avoid the sun at noon, because of sun burns.