Fisherpal, I just added one to our camper before this trip we are on now. I replaced one of the 1156 bulbs with a replacment that has 30 LEDs in it. We needed it inside for reading etc. I have it on right now, as a matter of fact, as I write this note. I wanted to reduce battery drawn when we are boondocking. I am sure it does but I am not real happy with the light output with this bulb. With shipping the one bulb cost over $29 and it is not near as bright as the 1156 that I replaced. The light coming from it has a blue cast. I think there are white lights that are available. I found some online that are sold in Australia but I didn't want to order from out of the country. I think they might have actually been better than the one I got. The one I got is on this web page
http://autolumination.com/1156_1157.htm . Scroll down to see the 1156 30 LED bulb. One thing they told me is to be sure to get a current limiting bulb because if it is not, the LEDs won't last long because when an RV is plugged into shore power, it will overpower the LEDs.
We ended up only boondocking one night on this trip but it worked just fine with me not being concerned about battery drain. We had quite a bit of other battery drain going on during the night. I run a CPAP unit all night and we also had to use the furnace some. By the way, we were boondocking at the Tampa RV Supershow.
I would like to hear if you end up getting a replacement from somewhere else. I am still looking for a better replacement. I would like to hear what you get and what you think about it. I actually think this bulb that I got is an older technology. I might be wrong.