The 2 issues basic I have with the light are the immediate losses incurred by the lenses and I want to better understand the thermodynamic characteristics.
I dont think the lenses help to blend the light as they are focusing it, just a fact. I think there are lenses that would provide for better blending and id like to see the secondary opitc with a focal length of infinity.
How far is the MH from lettuce.
Afreed on heat tolerant varieties, these are blackseeded simpson and buttercrunch, IIRC only mildly heat tolerant.
Your real world testing conditions are invaluble. If you can do anything with manual white balance, pics of what the distribution look like up close (like a sheet of paper 6 in infront of the light), and what heatsink temps are in relation to envirnmental temps, I would find the information worth evaluating.