Further information relating to examination of SPD Curves

This web-page is designed to display example spectral distribution curves for tested light sources. For more information relating to the graphing library used in this page see the dygraphs website. For more information about the project in general contact Joseph Padfield.


Calculating the CCT, Duv and CRI from the SPD curve of: Osram Par 38 120W: TH

  • Display Results
  • Graphs

Illuminant: Osram Par 38 120W: TH

CCT: 2594K | Duv: 0.0007 | CRI: 99.3

CRI Calculations

CRI - Calculation Summary


IlluminantBlack Body
X113.3719113.6649
Y100100
Z27.776828.8204
u0.26730.2674
v0.35360.3529

TCS01 TCS02 TCS03 TCS04 TCS05 TCS06 TCS07 TCS08 TCS09 TCS10 TCS11 TCS12 TCS13 TCS14
ReferenceU39.7016.56-15.85-42.26-36.68-22.8218.5648.01130.1826.61-51.60-34.3535.17-11.54
V1.456.6711.916.58-1.86-10.91-9.78-7.02-2.9814.565.68-20.924.436.59
W63.3761.3561.0057.5558.6357.8660.6664.3448.1583.1847.4123.3081.9539.57
IlluminantU39.5516.41-16.02-42.14-36.49-22.5918.5947.89129.7926.24-51.42-33.8535.00-11.64
V1.466.6711.906.52-1.89-10.93-9.74-6.99-2.9614.565.60-21.044.426.59
W63.3661.3561.0457.5658.6357.8460.6364.3148.0883.2147.4223.2281.9439.60
ΔEUVW0.150.150.170.140.200.230.050.130.400.370.200.510.170.11
Ri99.3199.3299.2099.3699.1098.9299.7799.3998.1698.3099.0897.6499.2399.51