We are using Cree and Samsung in some new boards. We are always testing new toys.
So I thought the PAR Mapping by a grow shop and independent company might be something of interest in supporting our PAR grids for the 500 since it was in question.
I know no matter what I type you will be...
The PAR-FORCE 500 fixture directs the light inwards to maximize the 3 x 3 area and our edges took a hit. That said the metrics measure within a few points from the grid above. Here is a 3rd party par mapping session who measured with a LiCor quantum meter at 12 inches.
PPFD per watt
1.35...