I did some research on the subject of LED language at my local RV dealership.
The owner of the dealership had the best way to help me determine what would work best...he took me into actual RV units (new Travel Trailers in for pre-delivery prep). I got to see with my own eyes. I wanted to avoid that "blue" and/or un-natural light some of these bulbs cast. I found the "Natural White"
To meet my standards and bought one test bulb. The retail cost for one bulb was over $10.00 but the test was well worth the cost...now I can buy off the internet and feel sure I will be a happy camper!
The factory interior lights
all were the same and were what the guy at the auto store identified as a "#921".
When doing a conversion from incandescent to LED all you do is match the base type of your current bulbs. Then select either Natural White, Warm White or whatever other name the mfgr has given his product. Try a single test bulb first as this will prevent a costly mistake.....it is all very easy once you do the initial fact finding...no need to change the fixtures.
I am about to order a dozen from Amazon...best price...least negative comments from other RV reviewers...my bulbs translated to #92111803...921/T15 wedge base...190 Lumens..Natural White.....I did note all these bulbs had a very broad operating range for safe voltage...from less than 12Volts thru 24Volts.
Cost for a dozen...$69.95..... Much better than over $10 each at the RV dealer!