math day...
so i compiled a more better graph of mutually supporting COB overlap PPFD based on robincnn data
Bare CXB 3590 at 12" in a 4'X4' area with no walls to reflect
Max PPFD 935
Min PPFD 430
with reflected walls
Min PPFD ADJ 645
CXB 3590 with Stella HB at 18" for a 5'X5' area (Blue Box)with no walls to reflect
Max PPFD 1045
Min PPFD 508
with reflected walls
MIN PPFD 762
The HID PPFD Measurements were taken in a reflective walled room clearly; the edge measurements increased 50% while doubling distance from canopy.
the PPFD constant is that distance increased every 50% lead to a loss in PPFD of ~50% with both HID and LED
PPFD constant-ish is that walls increase PPFD ~50% at edge based on robincnn measurments and
so in a walled room for the COB measurements you will see minimum adjusted
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