Phorad® SC-850 Luminance & Illuminance Photometer

Combined Display and Ambient Light Measurement
  • Radiography Medical
  • Medical Imaging
  • Inspection Environments

     

Overview

The Phorad® SC-850 combines luminance and illuminance measuremet in a single instrument, enabling a complete evaluation of both display performance and surrounding viewing conditions.

Designed for regulated environments, the SC-850 supports ASTM E1742/E1742M practices and is calibrated using NIST-traceable standards, ensuring reliable and repeatable results.With over 80 years of light-measurement experience, Phorad instruments are trusted worldwide in medical imaging and industrial QA programs.

Key Features

  • Wide dynamic range luminance measurement for diagnostic displays

  • Wide dynamic range illuminance measurement for ambient and room lighting

  • Combined display and environmental lighting evaluation in one instrument

  • Photopic response aligned with CIE 1931

  • Ideal for reading room and inspection environment surveys

  • NIST-traceable calibration and complete documentation

Applications

  • Radiology reading rooms

  • Diagnostic imaging environments

  • Industrial inspection and QA lighting

Why Phorad®

Accurate, repeatable, and audit-ready measurement solutions for complete viewing-environment quality assurance.

Optional Capability Callout

  • One instrument for display luminance and ambient light measurement

  • Designed for low-light to high-brightness environments

Technical Highlights

  • Display: 2.8-inch TFT color touchscreen with 240 × 320 pixel resolution

  • Sensor: Ultra-stable silicon photodiode with precision glass filters, accurately matched to the CIE 1931 photopic V(λ) response

  • Measurement Range: 0.05 to 1,000,000 cd/m² (supports foot-lamberts and nits)

  • Accuracy: ±5% typical under standard operating conditions

  • Cosine Response: ≤ 2% using cosine-corrected photodisc (Model SC-850)

  • Memory: Stores up to 10 measurement readings with quick recall via RCL function

  • Power Supply: Operates on 3 × AA alkaline or rechargeable lithium batteries; optional USB-C Spectra Power Bank supported

  • Firmware: User-upgradeable via USB-C, with support for open-source firmware and data logging

  • Construction: Rugged, hand-held enclosure with dedicated Power and Measure side switches

  • Warranty: One-year limited manufacturer’s warranty

  • Manufacturing Origin: Made in the USA

  • Note: Specifications are subject to change without prior notice.

Included Accessories

  • Calibrated Luminance Probe: Designed for accurate display surface luminance measurements

  • Documentation: Quick-reference guide with online warranty registration access

  • Instrument: Spectra Candela® SC-800 Series Photometer

  • Optional (Model SC-850):

    • Cosine-Corrected Photodisc for precise illuminance measurements in lux and foot-candles

Photometer

Spectra Phorad Photometer model SC-850

Why Spectra?

Since 1940, Spectra Cine Inc. has earned the trust of cinematographers, radiologists, and engineers worldwide. From Academy Award®–winning exposure meters to today’s advanced photometric and radiometric instruments, Spectra has consistently set the benchmark for precision, reliability, and innovation in light measurement.

Explore Other Spectra Phorad® Photometer Models

  1. Spectra Phorad® SC-850 Illuminance & Luminance Photometer Measures both ambient illuminance and display luminance in lux / foot-candles and cd/m², foot-lamberts, or nits. Supplied with a calibrated luminance probe and cosine-corrected diffuser for high-accuracy measurements.

  2. Spectra Phorad® SC-830 Luminance Photometer Engineered for high-precision display luminance measurement in cd/m², foot-lamberts, or nits. Includes a calibrated luminance probe for professional radiography and imaging applications.

  3. Spectra Candela® Phorad SC-800 Illuminance Photometer Dedicated to ambient light measurement, providing accurate readings in lux and foot-candles for controlled viewing environments and quality assurance applications.

Spectra Phorad Photometer Kit

Spectra Phorad Photometer Kit

All Spectra Phorad Photometers include a hard carrying case, NIST-traceable calibration certificate, 3x AA batteries and one-year limited warranty.

Contact :

Address

Spectra Cine, Inc. 3605 West Magnolia Boulevard Burbank, California 91505 USA​

Email

info@spectracine.com​

Phone No

818-954-9222​

Website

www.spectracine.com​