ILT1700, SPM068/QNDS3/R

Bench-top research low-level radiance measurement system

ILT1700, SPM068/QNDS3/R

Part Number: ILT1700, SPM068/QNDS3/R


Please see replacement ILT5000 product here.

The ILT1700 has been replaced the ILT5000 Radiometer which includes complimentary Datalight III software, faster measurement speeds, wireless data transmission, iPhone/iPad application, internal data storage, a broader measurement range and more…


Bench-Top Research Low-Level Radiance Measurement System

  • Industry Standard Research Radiometer
  • Direct Reading in Scientific Notation
  • Best Price Performance
  • Unsurpassed Reliability for 15 years
  • Dynamic Auto Ranging – no lost samples in pulsed applications
  • 10 Decade Dynamic Range
  • 0.1 Percent Linearity
  • 40 Decade Integration Range
  • Light Integration up to 18 Years
  • 10 Calibration Factors in Memory
  • Made in the USA
  • Custom & OEM Inquiries Welcome!
SPM 068 Response Curve

SPM068/QNDS3/R This photomultiplier detector with built-in power supply is fitted with our narrow field of view optic allowing geometrically accurate radiance measurements in very low light level applications such as bioluminescence, phosphorescence, safety marking, and photon counting. The minimum spot size at a 1-inch distance is 25.4 mm in diameter. This detector is not typically recommended for contact luminance measurements due to secondary reflection characteristics. The detector comes equipped with a QNDS3 attenuator to prevent overexposure of the detector but it may be removed for ultra-sensitive light measurements. The detector has two gain modes - high and low - to vary the dynamic range to suit the measurement application. Calibrations in W/cm2/sr with and without the QNDS3 are provided.

SPM detector


Dynamic Range: With QNDS3: 1.37e-11 to 1.37e-4 W/cm2/sr (high gain mode) or 1.69e-9 to 1.69e-2 W/cm2/sr (low gain mode). Without QNDS3: 1.37e-14 to 1.37e-7 W/cm2/sr (high gain mode) or 1.69e-12 to 1.69e-5 W/cm2/sr (low gain mode).

Field of View: ± 0.75 °
Measurement Range: 320-600 nm
Dimensions: 167 mm x 42 mm dia.
Ordering part#(s): ILT1700, SPM068/QNDS3/R

R Cosign






Please note: Care must be taken not to expose this detector to direct room or sunlight signals with the QNDS3 attenuator removed while the detector is connected to the meter to prevent irreparable damage to the photomultiplier tube.


Filters and input optics are removable and may be ordered separately from the detector assembly to allow filter and input optic swapping.

For the latest meter specifications, data sheet, installation guide, tech notes and software, visit the ILT1700 page here.

To view additional Radiometry Light Measurement Systems, visit our application page here.