I'm looking to replace the existing track lighting in my apartment. 
I've never installed track lighting before and it seems that track
lighting is categorized two ways: Low Volatge and Line Voltage. 
What's the difference between the two and does it matter which one I
choose?  The room I'm looking to light is fairly small - 13' x 14'.
Thanks!

Hi -
  
This web site clip says it best:
  
FormPlusFunction.com
http://www.formplusfunction.com/tips.html
"Low voltage is 12V and line voltage is 120V. Usually the track itself
is line voltage, but the track heads that are attached are either low
voltage or line voltage. If needed for special lighting effects, low
voltage and line voltage track heads can be used together on the same
track.  The most noticeable difference between the track heads is the
size: low voltage track heads can be a lot smaller while still putting
out a comparable amount of lumens to larger line voltage heads. Each
low voltage track head usually comes with its own transformer. Low
voltage track heads for residential purposes use 20 – 75 watt MR-16
halogen lamps.  Line voltage track heads are generally less expensive
because they don’t need a transformer. They are larger in size. For
very high ceilings these might be the better choice, since some can
accept higher wattages."
   
Additional Link:
Search Spec
http://www.searchspec.com/index.html
   
Search Strategy:
"low voltage" "line voltage" "track lighting"
  
 
If you need any additional information, please ask before rating this
answer.
 
Thank you,
  
jbf777-ga
GA Researcher

Quick answer!  Just what I was looking for.  Thanks!