Low light level testing
Night vision technology

Display and illuminator testing
Luminescence and fluorescence

Photography and film studios
Clinical studies


High sensitivity
Wide dynamic range

Excellent long term stability
Cosine corrected

NIST traceable calibration
Selectable units


Angular response:

5% for angles <60°


PMA2131 - 200,000 scotopic mLux, 20,000 mft-cd, 120,000 μW/m2 
PMA2131B - 385,000 Lux, 36,000 ft-cd, 220 W/m2
PMA2131D - 500 Lux, 48 ft-cd
PMA2 131E - 5,140 Lux, 480 ft-cd

Display resolution:

PMA2131 - 0.001 Lux 0.01 ft-cd 1 µW/m2
PMA2131D - 0.001 Lux, 0.001 ft-cd

Operating environment:

32 to 120 °F (0 to +50 °C) no precipitation


5ft (1.5m)


1.6" (40.6 mm)


1.8" (45.8 mm)


7.1 oz. (200 grams)
Spectral Response
Follows CIE scotopic spectral luminous efficiency curve (400-600nm) Figure 1


The spectral response of the human eye changes with light intensity. The eye has two distinctive spectral responses, which are defined according to the brightness of the light entering the eye. The first spectral response of the eye occurs under typical daytime lighting conditions (photopic) defined for light intensity greater than 0.1 Lux. The second spectral response occurs under low light conditions (scotopic) defined for light intensity between 0.01 and 0.0001 Lux. Light intensity less than 0.0001 Lux is undetectable by the human eye. The eye's shift from the photopic response to the scotopic response is know as the Purkinje shift. The scotopic spectral luminous efficiency curve peaks at 507 nm and it is normalized to 1 at that wavelength.
PMA Series capabilities and applications
Solar Light offers sensor and detector options for use in a wide range of applications.
Sensor and Detector Options
Sensors must be used with a Solar Light Radiometer.
Included Accessories

1 year Standard Warranty

SOLAR LIGHT COMPANY warrants that the equipment has been carefully tested, inspected and left the Factory in proper working condition, free of visible defects.  SOLAR LIGHT COMPANY warrants the equipment to be free from defects in material and workmanship, under normal use and operation, for a period of one (1) year after the date of initial operation, or demonstration; or eighteen (18) months from the date of shipment from the Factory; or whichever occurs first. The warranty is limited to the free replacement of all-defective parts and free labor during the first year of warranty.  Defective parts replaced under this warranty shall become the property of SOLAR LIGHT COMPANY. The above stated Warranty is subject to the following conditions: Equipment being installed within the United States of America, Canada, or sold by authorized SOLAR LIGHT COMPANY representatives or their agents outside the continental United States. The equipment being installed is operated and maintained in accordance with SOLAR LIGHT COMPANY’s operating instructions, maintenance instructions and specifications. Utilization of only SOLAR LIGHT COMPANY’s authorized parts and components.  The utilization of a duly authorized representative for all work performed on SOLAR LIGHT COMPANY equipment during the warranty period.  Any variation(s) to the above warranty must be in writing and mutually acceptable by SOLAR LIGHT COMPANY and the customer. The warranty shall not apply to damages resulting from errors in installation, nor shall it apply to any equipment, which has been subject to damages, alterations or misuse by the purchaser.  Parts of the equipment, which would be generally considered as expendable service items during normal use, such as fuses, lamps, detector shields, etc., are not covered under the warranty. THERE ARE NO WARRANTIES, WHICH EXTEND BEYOND THIS DESCRIPTION, AND EXPRESSLY NO IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SOLAR LIGHT COMPANY BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANTICIPATED LOSS OF PROFITS SUFFERED BY THE PURCHASER.