Hi Karl, We actually touched on this during our engineering team meeting. AT this time we do not have 840 nm products, the closest I see is 860 nm on PetriClear. As I send this message, I will also send an email with an excel sheet that lists the part numbers we have and the light wavelength/ colors they have. The sheet may be helpful in the future, do let me know if you have any questions about it. - Eric