MIMedGrower
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Just simple physics. More light produce from a single area like a spot light would create more intense light over a lower area and would need to be further than the same wattage dispersed over an area.
Let's not compare apples and oranges. Ppfd is ppfd one is not going to create any more bleaching than the other.
Can you link me the exact fixtures you are using from each and over what area and i will try to point out why you may be seeing this
Added: let's not forget lux is not an ideal way to measure for ppdf and should only be used as a rough guide. While the lux may be the same the ppfd can be much different.
Timber says their layout is more diffuse than a board.