Since I got called out... I've been very happy with the sp250s so far. I've had them about six months now. I use 2 x
sp250 in a 5x5 tent, but my canopy is about 2.5' x 4'. If I were to use the entire tent, I'd use three, possibly four, sp250s. Depending on your watts per square foot requirements, you might consider that when comparing costs. Dimming isn't an issue for me since my tent is 8' high.
I was very interested in both the
gavita and fluence too, and during my research I found this video. It has the PAR charts you were looking for. Since those lights produce an even footprint I don't think the charts are so important as when shopping for a light that has more of a spotlight effect.
I had planned on mounting the two bars together, allowing room for a future third, in a grid configuration like the other two brands. In hindsight, I'm glad I didn't. Since I grow multiple strains together, I like the flexibility of being to independently adjust the lights to allow for an uneven canopy. Depending on your growing style, this might be a consideration for you too.
Hope this helps.