The AGLS light sensor contains a silicone photo diode that can be exposed to ambient light through an optical filter, which very accurately simulates the spectral response of the human eye’s photopic response, in order to measure illuminance in lux units. A luminance adapter can be screwed onto the base unit in front of the photo-diode for the measurement of luminance in cd/m2 units through an aperture with a 10-mm diameter. Accu-Gold automatically detects the presence or absence of the luminance adapter and automatically selects the appropriate units
| Light Sensor | Light Sensor | Resolution |
| Luminance Range | 0.05 to 50,000 cd/m2 | 0.01 cd/m2 |
| Illuminance Range | 0.05 to 50,000 lux | 0.01 lux |
| Luminance Aperture | Ø10 mm measuring field. Contact measurement focusing lens 1:1. | |
| Calibration Uncertainty | <3% of value or 0.05, whichever is greater, relative to Illuminant A. | |
| Calibration Traceability | Traceable to NIST and international standards. | |
| Photopic Response | <4% (Deviation from 1931 CIE photopic curve standard) | |
| Cosine Response | <4% (CIE f2 test) | |