040ADV-22-R-0022 Amendment 0001.pdf

Amendment: 040ADV‐22‐R‐00220001

The purpose of this Amendment 0001 is to provide a response to the following question.

Solicitation 040ADV‐22‐R‐0022

QUESTION: The scope of this Statement of Work encompasses the acquisition of 2 benchtop spectrophotometer color meters capable of testing using different light sources at different angles using different sized apertures.”

A spectrophotometer will illuminate samples with a single light source (typically a daylight simulator), and the software then provides for calculation of color differences in various light sources. Diffuse spectrophotometers (d/8 or d/0) illuminate samples uniformly from all angles, while goniophotometers provide the ability to measure at specific angles. For paper measurement, typically a d/0 instrument is used rather than a traditional d/8 spectrophotometer.

So that I may quote the correct replacement instrument, i.e., one that provides as a minimum the same capabilities as the instruments that are being replaced, can you share the make and model of the instruments that are being replaced? If not, can you specify if the requirement is for d/8, d/0, or goniophotometer benchtop spectrophotometers?

Response: “The scope of this Statement of Work encompasses the acquisition of 2 benchtop spectrophotometer color meters capable of testing using different light sources at different angles using different sized apertures. The largest aperture shall be 25mm and the smallest shall be 6mm. All units will come with calibration color chips (White body, Black Body and Green body) to calibrate and check unit. The bench top instruments shall include the light source D65 with 2‐ and 10‐degree observer. Color testing can be performed in multiple modes which includes reflection. The specular can be included or excluded. Color is calculated using the instrument software and the ASTM D 2244 CIELAB methods which includes DE*, DE*2000, DEcmc.”

“The hand‐held unit shall be capable of testing color and color density using 45/0 optics.”

“The software shall be capable of selecting different light sources, observer, optical modes, specular inclusions etc.”

The Benchtop units are used for multiple types of materials, paper is just one of them. The Hand‐held unit can be used for d/0 testing. The software for the instruments can be the driver for selecting illumination, observer reflectance etc.