That's what I was looking for.
Actually, what I found out today is that a 5 ohm to 6 ohm, 10watt should approximately reduce the brightness by 1/2.
I'm going to assemble a small rotary switch and use three taps; full, 1/2, and 3/4 brightness. I think I found one that will mount right in the fixture.
I'm planning on using this on two light fixtures; one in the tv area, and one over the headboard of the bed. My fixtures are the typical 2 bulb/two position switch, so the second position on the fixture will always be full glitter.
I've happily replaced the first position bulbs with the 32 led boards in all the other fixtures in my rig, and very pleased with the results! I found that info in this thread: LED 12 volt lighting: Long term results
Thanks for the link to Eastern light bulbs. Eventually I'm going to get up to speed on LED's and make my 1/2 & 3/4 brightness bulbs using them.
Thanks again to all for your replies. This is a great forum.