You can also go to Home Depot or Lowes, go down the Low voltage landscape lighting aisle and get one of those low voltage lights (not the solar ones but the hardwired ones). Dump the "transformer" box if included and wire it directly to your 12vDC system. A 4W bulb should be plenty if the light is close. We used 7W in the Class C since 2006 and they are still working just fine (my daughter is living in the Class C now). I also put one
on the exterior of the Class C to use as a porch light. Gives a nice low light to not trip over anything and locate the door knob without lighting up the whole site. I know very little about LED's but I'm pretty sure that I don't want any, based on what I do know.
Currently the LV landscape ones like I used are running $11. So you would be paying about $11 for the light (if you used the one I linked to), no extra stuff and the replacement bulbs are pretty cheap (4 pk for $4
). I have even bought the replacement bulbs in Wal-Mart.