Distribution photometry is performed on lamps and luminaries to produce IES files. IES files are electronic files which contain the data that represents both the distribution (intensity in candelas at combinations of lateral and vertical angles) and amount of light being emitted (lumens) from either lamps (light bulbs) or luminaires (light fixtures). Architects, engineers, lighting designers and others import these IES files into their lighting design software. With the lighting design software, they can produce lighting layouts that accurately predict and show (on architectural drawings or 3-D renderings) light levels for both indoor and outdoor applications.  


Standard ITL Indoor Report includes:
  • Candela Tabulation
  • Polar Candela Plots
  • Zonal Lumens and Summary
  • Average Luminance (Note: Extra charge for luminaires requiring custom luminous area calculations)
  • Zonal Cavity Coefficients of Utilization
  • Total Efficiency or Efficacy
  • Luminaire Spacing Criterion
  • Photograph showing Luminaire Dimensions
  • Reflectance of Paint (where applicable)
  • Shielding Angles (where applicable)
  • IES File
  • Test Report in PDF format
Incandescent – One lamp in Luminaire
  • One lamp in luminaire
  • Each additional lamp in luminaire
Fluorescent – Linear Lamps
  • Linear lamps, with one to four identical lamps
  • Each additional set of one to four identical lamps in luminaire
Fluorescent – Non-Linear Lamps
  • U-lamps, BIAX, Compact, Circline, 2D, Induction, etc.,
  • with one vertical lamp or one or two horizontal lamps
  • Each additional vertical lamp, or set of one or two horizontal lamps in luminaire
HID (Mercury Vapor, Metal Halide, High-Pressure Sodium and Low-Pressure Sodium)
  • One lamp in luminaire
  • Low-Pressure Sodium lamp in luminaire
  • Each additional lamp in luminaire
  • Absolute Photometry
Possible Adders/Options – Applicable to Indoor Photometry
  • Driver case temperature
  • Testing angles that require extraordinary aiming/setup time and/or odd angle sets requiring additional testing time.
  • Coffer, per assembly
  • Custom luminous area calculations for luminance data
  • Flux measured in two hemispheres requiring a second setup in order to gather data in upper and lower hemispheres, unobstructed by the goniophotometer. One setup can usually gather light up to approximately 160-degrees vertically from the primary direction (up or down). Testing that has light directly above or directly below the primary direction.
  • Additional Iso contour plots
  • Lamp Cold Spot Temperature
  • Prorate to other lamps/lumens
  • Quick Estimator Chart
  • VCP, ordered with photometry
  • VCP, ordered after photometry
  • Hazardous lamps (Ozone,UV, etc.)