I am really thinking about it I promise. Also reading and researching about it. I see plenty of scientific studies showing that there is an apex of light intensity that chlorophyll can process, but nothing quoting that it shuts down or anything.

You really had a poor yield from combining HPS and MH? And your friend? I'm just trying to figure out why. I have done my fair share of reading both Rosenthal and Frank, along with Cervantes and Soma. I have NEVER seen anything that suggests that mixing HID's would give you a diminished yield. I am simply asking you to either explain the variables that led you to your conclusion, or quote something that you have read.

Too many times on here I run into people who think I'm the asshole for challenging facts. If you can show me something that makes sense that says what you do, I'll definitely read and consider it. I'm just trying to make sense of these things, but if you want me to leave your thread here and go start my own on the subject I will. I'm curious to see how others feel about this, and what their experiences may be with it.