Quoted from latenite04:Great looking puppet. Did you make the entire thing or find one and add the eyes? You could try a 4LR44 battery, mainly used in dog collars. It's 6v so you won't need any resistors and much smaller than a 9v. This is the difference between two cr2032's and one 4LR44 hooked up to a blue 4smd bulb.
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2xCR2032
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4LR44
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What app are you using to measure brightness?? This would be handy for all those bulbs I accidentally mixed together, I have trouble differentiating the 1SMD and 2SMD