You can fake the light a lot in photoshop, just take a look at most of the popular photos on 500px these days. Fake glow and haze, orton effects out the yingyang, glowing halos spilling over the edge of the mountains on just about every single sunrise/sunset shot. It's the popular trend in landscape photography these days, and probably one of the reasons I am currently more drawn to strong compositions over strong light, because I see too many pictures with photoshopped light, but it's nearly impossible to photoshop yourself into a stronger composition.
*not arguing against photoshop, I use it a fair bit myself, but more against the complete overuse and abuse of it I see by most popular landscape photographers these days.