Sorry but I still think lumens are the way to track it.

Yes i too cnanot understand if I have one bulb at 10K lumens and add 5 more, how the resulting light doesnt equate to more lumens.

Also, sure plants done see like we do....but we dont 'see' lumens and we dont 'see' photons either. We see what is rated at a CRI, or color rendering index.

Plants see KELVINS.

Heck I am not gonna write a bood about lumens and photons anyhow.

I just gonna say get your ass some high Kelvin temps CFL and go to work