Spectral Power Distribution Curves

Spectral Power

Spectral Power Distribution Curves (SPD) provide the user with a visual profile of the color characteristics of a light source. They show the radiant power emitted by the source at each wavelength or band of wavelengths over the visible region (380 to 760 nm).

  • Incandescent Lamps and Natural Daylight produce smooth, continuous spectra.
  • High Intensity Discharge Lamps (HID) produce light in discrete lines or bands (used in spectral analysis to identify or fingerprint the material producing the light).
  • Fluorescent Lamps produce a combined spectrum -- a continuous or broad spectra from their phosphor, plus the line spectra of the mercury discharge.

In general, continuous spectra or very full-line spectra produce less distortion of object colors than a few discrete lines.


To view a file, click the name below.To view a comparison between distribution curves, select any items below and click compare.

Incandescent and
Halo-Phosphor Fluorescent Colors
Tri-Phosphor
Fluorescent Colors
HID Colors
Outdoor Daylight
Incandescent
Reveal® (Compared to Soft White Incandescent)
Daylight (D)
Chroma 75 (C75)
Chroma 50 (C50)
Plant and Aquarium (PL/AQ)
Cool White (CW)
Cool White Deluxe (CWX)
Sign White (SGN)
Warm White (WW)
Warm White Deluxe (WWX)
SP65
SPX50
SP41
SPX41
SP35
SPX35
SP30
SPX30
SPX27
Clear Mercury
Deluxe White Mercury
Low Pressure Sodium (LPS)
Lucalox®
Deluxe Lucalox®
Multi Vapor®
Phosphor Coated Multi-Vapor®
MXR (Multi-Vapor®)
Arcstream™ 4000K
SPXX CMH
Arcstream™ 3000K
ConstantColor® CMH