the plan is to switch these out to LED as we go...
the first ones are 8W fluorescent replacements, they are $17.91ea with free shipping from Amazon.
We picked the Natural Whites.
Green LongLife 3528102 LED 12" Replacement Light Tube with T5 base 300 Lumens 12v Natural White
Note this bulb needs you to remove the ballast and plug the bulb directly into 12V
You can see the flying lead for 12v in black.
This bulb fits neatly in the housing. However you have to basically disconnect the ballast entirely (easy enough, just cut all the cables (make sure its switched off before you cut the leads)) THEN you have to also cut the wires going to the socket ends (especially the one that joins the bulb on one side to the other (basically cut all the socket end leads (otherwise you'll blow a fuse))
Verdict: nice and bright.. I want to replace them all.. but the price is high.. so I'll wait for the bulbs to fail and go one pair at a time...
The coach has plenty of "1141" 12v bulbs...
looking at google apparently this is 19watts.. the 1156 bulb is a acceptable size also..
Amazon has:
These bulbs are really great.. one was bad out of the box, Amazon gave me a refund (I had to call them, as the only online option was to return the box of 12)
Online reviews indicate there maybe some attrition at 2-3 months, we will see...