Yeah, I'm mapping out the values now to see the relationship...
Hoppy, I have a question about your PAR - distance chart.
Your graph implies a parabolic curve, meaning the closer you get to the bulb, the more it gets to infinity or to the max value (the sun 2000 PAR). This is assuming your bulb is outputting at the level of the sun? It doesn't seem right.
I'm definitely getting a fixed value no where near the maximum with my DIY meter.