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Posted By: JSHarrisIf you could measure the surface temperature of the bulb and the outside of the container I suspect you'd be able to determine this for sure.
Posted By: Ed DaviesIs that last number missing a zero immediately after the decimal point?
Posted By: bot de pailleWas it a covered CFL?
Posted By: Ed DaviesHave you considered a test with the foil wrapped round the outside of the jar?
Posted By: CWattersHere is my take on the experiment..You might think that the foil reflects the light but actually it absorbs most of the light. What happens is the foil reflects the light many times but each time it absorbs a little until eventually it's all absorbed and converted to heat. Obviously some is also absorbed by the bulb but lets ignore that for the moment.Where the foil is located matters...In the case of the foil covered bulb all the light is converted to heat near the middle of the jar. It's conducted to the outside world through the air and glass of the jar.In the case of the foil lined jar the light is converted to heat near the inside surface of the jar. It's conducted to the outside world via the glass jar. Some of the insulating properties of the air in the jar have therefore been bypassed because the energy travels through that as light not heat.
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