Sun light cures the resin extremely fast, you cant print in the sun.
you can print in the shade.

The fact that the sun cures the resin is very handy for printing so fast that the resin int fuly cured and then finishing the job in the sun.
If its not sunny out you can still do this with a uv light source ( any light between 405 - 375 nm works great).

Normal room light isn't a problem during the course of a 12 hour print in my experience so far.

Although one time we thought some un noticed source of uv light had made it into the room, the surface of the liquid resin started turning into gel during a print.
after searching hi and low for the new and elusive light bulb, finaly we realized that the mirrors in our new printer had finger prints on them, which caused some of the
light from the laser to diffract all over the build volume of the printer.... so thats something to watch out for.