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These diodes tend to measure between 487nm and 493nm, so you can get a difference in its color depending on its wavelength. But, these diodes don''t tend to shift much by current. They do with heat, so a good heat sink is the most important if you want to keep the WL stable.I set it low so the wavelength don't change much i have another set at 130mA ( 5mA +/- ) and i can see a difference in wavelength i take some pictures tomorrow