In the first set of Hawthorne experiments dealing with lighting, what was the main conclusion?

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The main conclusion from the first set of Hawthorne experiments, which dealt with lighting, was that employees work harder when they receive added attention, a phenomenon later termed the Hawthorne effect. This finding indicated that the social and psychological factors in the workplace could have a significant impact on productivity, beyond the physical conditions such as lighting.

In the First Set of Hawthorne Experiments Dealing with Lighting