I sliced one 5700K R9050 from Eurekatronix, optic is Olga S (lightly beaded 30mm TIR lens)
Original :
CCT = 5440K (Duv 0.0039)
Color Rendering Index (Ra) = 92.5 [ R9 = 65.8 ]
R1 = 91.8 R2 = 95.9 R3 = 97.4 R4 = 90.4 R5 = 91.1 R6 = 91.8 R7 = 94.2
R8 = 87.0 R9 = 65.8 R10 = 89.5 R11 = 90.1 R12 = 71.9 R13 = 93.1 R14 = 99.1
IES TM-30-15 Rf = 88.95 Rg = 96.81
Sliced at 1.10mm :
CCT = 5090K (Duv –0.0006)
Color Rendering Index (Ra) = 93.9 [ R9 = 74.2 ]
R1 = 94.3 R2 = 97.2 R3 = 97.0 R4 = 92.8 R5 = 93.5 R6 = 92.4 R7 = 94.4
R8 = 89.5 R9 = 74.2 R10 = 92.1 R11 = 92.5 R12 = 74.9 R13 = 95.4 R14 = 99.0
IES TM-30-15 Rf = 89.27 Rg = 98.07 CCT = 5090 Duv = –0.002337
It’s quite effective at improving the tint, color rendition get bumped up a bit, it’s unfortunate that Clemence doesn’t have any 4500K anymore, would have made a nice neutral-warmish LED with rosy tint since they had a better tint I believe.
With a Clear TIR (Olga RS) there is a strong eggyolk effect, significantly reduced with slicing but still too apparent.