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You would have to specify how much light to get an answer. Light would scatter and be attenuated in the air. There are also different wavelengths in a typical 100 w bulb. Suggest you conduct an experiment by setting up a 100 watt bulb outside and then walking away until you can't see any light. Presuming you have a clear path to the bulb, it will be quite a ways.

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13y ago

What else can I help you with?

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