If they are polarized, then making them lighter probably isnt a possibility, as the polarization films usually only come in one darkness (and blue and red polarized isnt very common to begin with). You would probably have to take them somewhere and get between a blue 1 and 2 tint (10%-20% tint). Alot of optical places can cut a plano (non Rx) lens and tint in house for pretty cheap
Indy may have another option, though
Indy may have another option, though