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User SPD Input

SUBMIT





 
Wavelength (nm)
  Irradiance (A.U.)


SUBMIT
xy: ■  | CCT:  | Duv:  | CRI (Ra):  | R9: 

Calculate Color Rendering Index (CRI) from Spectral Power Distribution (SPD)

This online CRI calculator takes a spectral power distribution (SPD) input in either 1 nm or 2 nm resolution, and calculates the Color Rendering Index (general and extended), including the individual R values. Click on "Input SPD" to load your SPD. Several notes on the SPD input:

- For best results, copy and paste irradiance data from a spreadsheet program or plain text editor, with line breaks between each wavelength data point.

- Wavelength range is 380 - 780 nm.

- Irradiance values are in arbitrary units. The calculator will automatically normalize all values.

- CRI values are not calculated for non-white sources. If you do not see a CRI result, confirm that your light source has a DC < 0.0054.

INPUT SPD

SPD Input


Calculated CRI General (R1-R8):

-

Calculated CRI Extended (R1-R15):

-

CRI Individual R Values Result

  • Score:
  • 25
  • 50
  • 75
  • 100
  • R1
  • R2
  • R3
  • R4
  • R5
  • R6
  • R7
  • R8
  • R9
  • R10
  • R11
  • R12
  • R13
  • R14
  • R15














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