yep, snakes can be made blind by putting too strong a light in their tank, especially albinos...
use a low wattage light, have it directly above the snake (as the sun would be) and remember that corn snakes are "crepascular" which means they come out in low light levels at dawn and dusk.. they are not designed to sit in bright light all day
only have the light on, when you want to see.. not day in day out when no-one is looking
or, use a red light, as reps can't see in red light..
whatever you use, make sure its guarded so the snake cannot get to it. even a low wattage tube light gets quite warm.
Thanks for the info, what i've thought of doing is (this viv i'm building has a false wall in the middle, so that for now i can keep both snakes in one viv but seperated) cutting out a block in the top back corner of the false wall, putting a cage in there and sticking the light in that. ?
i use a bog standard light bulb on a dimmerstat, connected to a timer on 13 hours, off 11 hours, that serves as a light and heat source, i've got a heat mat for night time when the bulb goes off, they dont need any uv, any bulbs need to covered with a guard as they get hot.
I've read a bit recently about UV tubes/any bright light possibly being damaging to snakes eyes - not just albinos either.
So what ever light you use I'd say keep it to dim and avoid any strong UV tubes.