Well, I no matter what settings or angle I tried to photograph from, I couldn’t get my camera to show the tint differences between my 3 ROT66 accurately, so I’ll have to write out what I observed.
The 3 ROT66’s I have are:
Nichia 219B R9080 4500k
Samsung LH351D + Lee 804 Zircon Filter ~4000k
Luminus SST20 HCRI 4000k
The comparison between the ones with the Samsung and Luminus LEDs is more interesting since they share similar CCTs. The Samsung emitters have the 804 filter over them, which makes them slightly less green, and according to Maukka’s measurements, puts them at or or very slightly below the BBL. The hotspot is massive compared to the SST20, but naturally less intense.
The Luminus emitters are maybe a little above 4000k according to my subjective impressions, and are on the green side of things. The Samsung emitters might slightly be below 4000k, but look to be very much on the BBL without too much green. I personally still prefer slightly more rosiness to the tint.
The Nichia emitters make for a beam profile that’s near identical to the Luminus emitters, although I would say the transition from the edge of the hotspot to spill is slightly more sudden on the SST20 emitters compared to the 219Bs. Again, LH351Ds throw a massive hotspot by comparison (really a huge, bright corona, with a small but subtle hotspot in the middle.)
I tried to take the 804 filter from the Samsungs and put it on the ROT66 with the SST20, but it seems as though Fireflies is now gluing in the Bezels, because I couldn’t take mine off. This might be part of their solution to solving the crushed XPL HI issues. So, the best I could do was put the lens with the Filter on it over the Luminus emitters with their lens already on.
Comparing the SST20s with no filter to the LH351Ds without the filter and/or lens, their tints are extremely similar, but when shining both on wood and skin, the SST20s shows more of a rosy vibrancy. The SST20s with the 804 filter on would be very special I think.
So, if I had to list my preferences in beam pattern and tint, it would be:
1: Nichia 219B R9080 /possibly Luminus SST20 HCRI w/804
2: Samsung LH351D w/ 804
3: Luminus SST20 HCRI
4: Samsung LH351D.