Because daylight has positive effects on most people's wellbeing?

I live in a place where winters are long, days are short and skies are either gray or dark.

Having the opportunity to see the sun even for a couple of minutes when coming out from work is a great feeling that has a big impact on people's mood and mental health especially at the tail end of winter. Electric lights don't have that effect.

I also spend more of my non-working time outside and I'd love to be able to go out for a run without a headlamp earlier in the year.

Hopefully they are expensive, full-spectrum bulbs that allow producing Vitamin D, or else everybody is gobbling a handful of supplements every day. SAD is a real thing.