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Thanks Rowland - my heat sink should be good for 100+ watts, but in the field I don't expect to use them stacked, although it'd be nice to have the option when on mains power.
When I was tinkering yesterday, I was getting up to 15C cool down from ambient running the TEC at about 2/3 power. Although this was with nothing on the cool side besides the temperature sensor, so not a real test. If I can replicate that with the cold finger I'll be happy, as my darks are very manageable below 10C.
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