Skip to content

Photosensor Modules

National Eye Institute / National Institute of Health

Announcement/Number:  EE21-005589
Post Date: August 19, 2021
Closing Response Date: August 29, 2021
Proposed Award Date: September 01, 2021
Project Title: Photosensor Modules
Contracting Office: National Eye Institute, Building 31, Room 6A52
Contact Point/Contracting Officer/Contract Specialist: Elaine Estrella,
North American Classification System (NAICS) Code (include): 334516 Size Standard: 1000
Classification Code: Analytical Laboratory Instrument Manufacturing

Offerors must quote on all items to be eligible for award. The Government will award a contract resulting from this solicitation to the responsible offeror whose offer conforming to the solicitation. 

Product Requirement / Specification

Part Number

Description of Requirement



Photosensor Module with PMT



PMT Module w/ QE = 17% min at 800nm, dark current = 0.6nA max.



Heatsink With Fan



Power Supply for Photosensor Module



Power Supply w/ 2.5 m fan and unit cables






NEI Laboratory / NIH
10 Center Drive
BLDG 10 RM 10C404
Bethesda, MD 20892


Payment will be made 30 days after internal receiving in NIH system.


Firm Fixed 


Product Specification must match requirement.

The Hamamatsu H7422PA-50 and H7422PA-50//001 are photomultiplier tube detectors which are needed for a specific scanning laser ophthalmoscope application (780nm-860nm, 50nW-500nW) that is currently implemented in the National Eye Institute Eye Clinic. The sensor is embedded in a housing module that is currently in use with a custom built adaptive optics scanning laser ophthalmoscope housed in the NEI eye clinic that was initially deployed under contract HHSN263201400011C. Under this contract the H7422A module was utilized. Replacement modules are needed to refresh aging detectors and ensure that adaptive optics images can continue to be taken. It is imperative that the same exact module be used to maintain instrument compatibility.  We have to date invested thousands of hours of time into testing and characterizing the performance of sensors within this housing module. Selection of any other housing module would likely result in long delays resulting from retesting of products from other suppliers. These specific detectors are only available directly through Hamamatsu due to the fact that we have requested specific customization on these modules (as indicated by the PA and //001 notation). There are no other commercial vendors or distributors that can provide these new photocathodes. Therefore, for the reasons detailed above, there is only one responsible source and no other suppliers or services will satisfy (FAR 6.302-1).

Closing Statement: This notice is not a request for competitive proposals.  However, interested parties may identify their interest and capability to respond to this notice.  Responses to this notice shall contain sufficient information to establish the interested parties’ bona-fide capabilities for fulfilling the requirement and include: unit price, list price, shipping and handling costs, the delivery period after contract award, the prompt payment discount terms, the F.O.B. Point (Destination or Origin), the Dun & Bradstreet Number (DUNS), the Taxpayer Identification Number (TIN), and the certification of business size. All offerors must have an active registration in the System for Award Management (SAM)

A determination by the Government not to compete this proposed action based upon responses to this notice is solely within the discretion of the Government. The information received will normally be considered solely for the purposes of determining whether to proceed on a non-competitive basis or to conduct a competitive procurement.

All responses must be received by August 29, 2021 and must reference number EE21-005589. Responses may be submitted electronically to or hand delivered in person. Fax responses will not be accepted.

“All responsible sources may submit a bid, proposal, or quotation which shall be considered by the agency.”

Last updated: August 19, 2021