I finally got rid of all of the power hungry incandescent lights on the interior of our SMB. My goal in replacing them was to find LED's to replace the original bulbs in the original fixtures without sacrificing performance. I purchased all of the bulbs from www.superbrightleds.com
. There are several good websites to purchase LEDs from but I found they have a good selection and the best technical information.
The first bulb I replaced was in our exterior porch light. I wanted the brightest light I could get that would fit in the original fixture but also wanted a low current draw so I could leave it on for long periods without worrying about battery drain. The bulb I used is part #1156-PCB-CHWP9, $21.95
To mount the bulb I cut a piece of foam board insulation (any styrofoam will work) so that when it is against the van body the light will point slightly downard. I then used double sided tape to attach the foam board to the fixture and the back of the bulb. It work great a puts out more light than the original bulb with a current draw of only 190ma. The light does have the blue tint that is usually associated with LED lights.
Next I replaced the interior spot/reading lights. For these I used the 1156-PCB-WWHP9, $21.95 which is the same bulb as above but putting out a warm whitet light. This bulb emits about the same light output as the original bulb but it is more diffused which actually makes it better for reading. This bulb and the one for the exterior both have a 120 degree beam pattern which is the widest I could find for an LED bulb. Again this bulb draws 190ma.
To mount them I took a tooth pick and used it to apply a small amount of clear adhesive caulking to the edges of the bulb. I then used a small block of styrofoam and masking tape to hold it in place until the caulking dried.
In the rear light over the bunk I used two different bulbs. We wanted good light for reading but also a dimmer light we could turn on at night that would not be blinding while laying in bed. In the center I used Part #4211-WW6, $1.95, current draw 18ma. In the outer bulb I used 4210-WWHP6, $14.95 current draw 163ma. These bulb fit in the original fixture with no modifications.
I hope this helps anyone trying to make a similar conversion. I would be happy to answer any questions.