I just made mine, I used a 47 ohm resister (I think it should have been slightly bigger since this will run it near its maximum of 30mA? it's a while since I've done much fiddling with electronics).. FWIW, I found it was quite easy to attach the resister to the +ve lead of the LED by cutting the lead short and soldering the resister right up close to the LED it fit easily inside the bulb base. works great - thanks for the inspiration!
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