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Originally Posted by Brian Miller OR:

Those are perfect.  Just what I had in mind.  Thanks!

 

Another question.  I'd like to run them off my DC power supply so they come on with all the other layout lights. What can buy/build to bring the power down to the 3 volts needed to run these lights? 

One alternative is a 99 cent shipping included DC-to-DC converter module off eBay but from Asia so it takes a couple weeks (search "LM2596 module").  You'll need a voltmeter to set the output to 3V.  Here's a re-cycled photo with incorrect voltage labels for your application but you get the idea...

 

boxcar

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Oh, if you don't have a voltmeter, check the Sunday Oregonian coupon inserts for the Harbor Freight page.  Here's the FREE voltmeter (no purchase required) shown in action below on a LM2596 module set to 3V DC.  The just-opened Harbor Freight in Tigard on 99 has these free items conveniently located on the back-left side of the store.  And while I'm always buying something they don't seem to give people a hard time that just come in for the free item.

 

ogr hf meter 3v

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