I think the sun issue would be decided by the plants more than anything. If you go to a greenhouse you will see they have some black matting on the ceiling to cut some of the sun because that direct sun all day long is not good. I think soil temp is more important from what I read this year with my peppers. I dont know what you are trying to grow so Im kinda in the dark here but you can google what you want to try and should find some helpful stuff. Thats what I did when the peppers didnt come up for a few weeks and I found out it was the cold temps. Even after they popped up, they went agonizingly slow, turns out, they didnt like the cold. I am new to peppers this year though, I just planted seeds and never read up or asked anything.
Sorry I didnt answer you question better but in short, I think indirect is fine as long as soil is warm, after that, go with what the plant wants for lighting.
HTH