Interesting to note that as power to the LED is reduced, there is fairly drastic change in CCT and Duv with T8 6500k (rounded numbers):
Level 1: 5800k, Duv=0.0090
Level 2: 6000k, Duv=0.0060
Level 3: 6300k, Duv=0.0030
Level 4: 7000k, Duv=minus 0.0007
Check out the Duv, this is a very green LED at low output in T8. It is clearly visible with white-wall and photography. But again I have noticed that with real life use this green bothers me very little in thrower (T8), and a lot in a flooder like Skilhunt EC150 (an absolute nightmare- review to come). But this is subjective, YMMV.