From: Design of a phosphor-converted LED based lighting system considering both the lighting and color uniformity
φcut
φc
ΔCCT (K)
2a (mm) × b (mm)
illumination uniformity
40°
52°
186
40.00 × 23.84
89%
45°
50°
264
40.00 × 20.00
90%
55°
43°
219
40.00 × 16.09
87%
60°
265
60.00 × 20.84
82%