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I'm planning to use a green LED as a sensor in my meter. The green ones are made from the same stuff as solar cells so they will generate a little current from light. The ones I have (green light but with clear lens) will put out 1.5 V from a white LED held about one inch away. I have a green lens one that will only put out .8 V at best so the clear lens ones are the way to go. I don't know what they would be after the sending light was filtered through two pieces of glass and an eighth inch of gas but that what I'm planning on using now.
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