Jack Allison wrote in
ink.net:

Since I'm a new instrument student, I can't comment on IFR at
night...but, having done a fair amount of VFR night flying, I've found
S-Lite's version of the lip light (can't remember the name at the
moment, has four LEDs, you can choose which color you like) to work
well. I went with green and like the results. Based on Bob's
comments, however, I'll have to look at my brand new Jepp charts to
see how they look under the green light.

The Jepp charts are very readable under green light, not so good under
red. Blue ink under red light washes out, but under green it appears
black. I haven't found a color except for green that isn't very visible
using green light.

--
Regards,

Stan