IGN UnHolyDisciple I came up with this idea when i was mineing i hated having to stop just to make torches. Here is the plugin http://dev.bukkit.org/server-mods/nightvision/
It also has great use for running in the dark and now haveing to worrie about falling in a hole to ur death.
I am in no way endorsing the following at all so please don't do this but. . . Couldn't someone just download a client such as Nodus and use Fullbright?
Donating for ext commads gives you /ptime which does the same thing or get a fullbright mod, as they are not illegal at this time, no need for yet another plugin doing what can already be done....
cjb is currently legal and has a nightvision feature, as well as other useful things all in one package. I tried nodus once, and didn't feel safe using on the server. Not to mention nodus is now illegal to have and will result in a ban if you are caught using it.