So the 660s spd looks kinda like a florasun's then, maybe a bit more intense (more phosphors) in the 660 zone, but otherwise same wavelengths covered? R/G/B wise that is?
It seems similar, but definitely more red judging by the picture. It's hard to compare accurately. Baically, while the flora sun has that wide low "swath" of blue that starts around 350 and settles around 570 in addition to the sharp peaks, the 660 has only the sharp peaks (extremely narrow) and no "swath" (I can't figure out a better way to describe that, sorry) so I figure that is where the extra red energy is offset. I think that it is pretty obvious the 660 has a good bit more red end just from the pics with that magenta hue.
Give me a minute, I am going to do some super imposing to see if evrything else lines up
Edit, okay: Yeah, the peaks line up as expected... however, here are a few differences:
(all observations are relative to their own charts only, as I can't be sure these are measured on similar scales)
-while the 440ish spike and the 550 spike on the Flora Sun are very uneven, with a lot more 440, they are almost exactly the same height in the 660.
-The Flora Sun's UV spikes do not exist in the 660.
-If you look at the Flora's chart, you will see a small spike at about 580nm. While that spike stays in the 660, the series of small spikes after that are completely gone, as well as the medium spike at 610.
-While the Flora has a small bump at 700, the 660 bulb does not but has a series of small bumps ranging from 740 to 800. They are very small, though.
Observations through scaling, which are estimations of relative distributions due to the scales applied being only relative to themselves:
Through vertical scaling, if I match the heights on the 550 spike and the 580 spike, it would seem that both the 410 and 440 spikes are significantly shorter in the 660 bulb... and that the 630 is a bump higher, and the 660 significantly higher. The valleys between are higher as well. I believe this would correlate with the idea of the bulb appearing so red.
In a similar move, I can scale the whole thing vertically to match on the 660 spike, but that wouldn't seem to make any sense because all the other spikes end up significantly shorter than the Flora's and there would be no logical explanation as to where the extra wattage is going from the missing spikes mentioned above, nor the extra wattage from the relatively shorter tri band spikes.