What is the maximum wavelength of electromagnetic radiation that can cause a transition?

Rod cells in the retina of the eye detect light using a photopigment called rhodopsin. 1.8eV is the lowest photon energy that can trigger a response in rhodopsin. What is the maximum wavelength of electromagnetic radiation that can cause a transition?

Can you please give an exact equation to solve this?What is the maximum wavelength of electromagnetic radiation that can cause a transition?
~689 nm, dark red.

E = ch/lambda, c = light vel, h = Planck's constant (eV-based) = 4.13567E-15 eV-sWhat is the maximum wavelength of electromagnetic radiation that can cause a transition?
Thank-you.

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