Dutch: Love the chart, and thank you! So anything above the 100% line is dangerous?? At 6", my lady was up to 175 PAR. A little too much? LOL
yeah...light distance is a tricky thing....and not all reflectors are created equal...some are better than others. The ones with crinkles seem to be better than smoothed polished surfaces...IMO.

I couldn't get my 400 watt HPS or CMH bulbs closer than 15 inches from the canopy. I have a smooth polished reflector...