Can better lighting actually boost your bottom line?

What would lighting actually benefit them, and what kind of lighting? If they do only a ceiling renovation, what would that give them? If they only implement a fatigue risk management system pushing people more outside, what would that deliver? Or if they invest in personal lights — like the ones I use — and recommend them to, for example, the older generation in their office or the people who actually need the most light, how much would those people benefit?

It's hard for me to do, because I'm really more of a production and design company. Doing these return on investment analytics for every company I work with would be really tough.