An idea of where to look for intelligent life

I have been reading about Gliese 581 g recently and I am intrigued by
the possibility of life on exoplanets.  After reading about the
potential of planets in the Goldilocks zone of a red dwarf system an
idea occurred to me.  I'm still unsure that enough bio-diversity could
exist in the terminator ring of a tidally locked planet to allow
intelligent life to evolve.  However,  if intelligent life did form on
a planet with a tidal lock, the inhabitants would most definitely come
to an obvious conclusion...

�If we can devise a way to light the dark side of our planet, we could
dramatically increase our habitable space�

Assuming that intelligent life has evolved on a tidally locked planet
to the point where they were able to create a safe and reliable method
to light their dark side, we may be able to detect this from our
vantage point.

This may appear to us as a binary system with a very small twin
orbiting on the outside of the habitable zone of the primary star in
the system.  This smaller (artificial) star would be in a synchronized
orbit on the far side of the tidally locked planet that fosters
intelligent life. The 'artificial light' would need to be large enough
to light a good portion of the dark hemisphere and would also need to
be of a mass low enough to avoid a negative gravitational effect on
the existing environment of the habitable planet.

Their solution may also involve planet based light sources, similar to
our night time solutions.  However, intelligence on a tidally locked
planet would logically create a permanent lighting solution as they
would be accustomed to continuous light.  In this scenario,  the
dimmer twin would most likely be the same spectral composition as the
parent star.

Given the ecological implications of artificially lighting a home
planet, this plan would be extreme and may only occur if the habitable
planet was in dire consequence.  Another possibility is that an
intelligence has created an artificial sun around a tidal locked
Goldilocks candidate in another system.  In this scenario,  the dimmer
twin may exhibit a different spectral composition then the parent
star, it may be similar to the creators host system.  In this case,
their conclusion becomes...

�If we light the dark side of this new planet.  We may be able to
increase it's usability�

Possible candidates:

Eta Cancri dwarf
binary L dwarf 2MASSW J0746425+2000321
CHRX-73
55 Cnc Red dwarf (could be a habitat)

Thoughts and Comments?
--Dave Bennett (dbennett @t bensoft d0t com)