Violet-to-blue Light
Most work suggests that the peak spectral sensitivity of the receptor is between 460 and 484 nm. Lockley et al. in 2003 showed that 460 nm (violet) wavelengths of light suppress melatonin twice as much as 555 nm (green) light, the peak sensitivity of the photopic visual system. In work by Zaidi, Lockley and co-authors using a rodless, coneless human, it was found that what consciously led to light perception was a very intense 481 nm stimulus; this means that the receptor in visual terms enables some rudimentary vision maximally for blue light.
Read more about this topic: Photosensitive Ganglion Cell, Discovery
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