SubLGT
Flashlight Enthusiast
For evaluation of automotive headlights, is an imaging photometer equal in usefulness and accuracy to a goniophotometer?
http://www.pro-lite.co.uk/File/automotive_applications.php
http://www.pro-lite.co.uk/File/case_study_automotive_headlamps.php
An alternative approach for in-house product development testing is an imaging photometer or colorimeter. Those from Westboro Photonics are powerful, CCD-based light and colour measurement instrument that provides for increased productivity compared with traditional goniometric measurements. Whereas a goniophotometer measures the illuminance and colour from a headlamp one direction at a time, a CCD-based imaging photometer can measure millions of angles simultaneously. Moreover, because the imaging photometer views the whole illumination pattern at once, localised illuminance and colour differences can be easily detected – artefacts that goniometric measurements performed at defined angles might miss. In addition, the capital cost of an imaging photometer is much less than that required for a typical motorised goniophotometer.
http://www.pro-lite.co.uk/File/automotive_applications.php
http://www.pro-lite.co.uk/File/case_study_automotive_headlamps.php