scope:

This IES Approved Method addresses the use of digital cameras incorporating a CCD array. However, it should be noted that other types of digital camera sensors, such as CID (charge-injection device) arrays, CMOS (complementary metal oxide semiconductor) arrays, and scanned photodiode arrays, could be acceptable for photometry. Requirements for accuracy and the special conditions for this form of light measurement are covered. The numerous factors to be taken into account for hardware selection and software development are described. Calibration requirements are specified, as are data reduction techniques.

Other uses of cameras to perform digital photometry, such as capturing the distribution of a luminaire by aiming the camera at the luminaire, close field photometry techniques, and methods using integrating spheres, are outside the scope of this report.

Requirements that are identical to those for conventional goniophotometry of luminaires and not described specifically in this document include:

• Lamp Selection and Seasoning

• Selection and Preparation of the Test Luminaire

• Luminaire Positioning

• Electrical Supply

• Electrical Instrumentation

• Thermal Environment (other than that for the camera)

• Luminaire Stabilization

• Special Considerations for Particular Lamp Types

These and other items are described in other IES approved methods and are incorporated herein by reference.