particular lighting types and these preexisting preferences could
have influenced our results. Future research should examine this
possibility, testing whether preferences might moderate the relationships
between lighting, mood and cognition.
The present results indicate that recent increases in the number
of LED technologies being incorporated into industrial lighting
applications may be justified given the positive implications for
worker performance. Relative to traditional fluorescent technology
with relatively low color temperature, LED appears to support
positive mood, extended wakefulness, and speeded performance
on both visual perceptual and cognitive tasks. These results add to
a growing body of literature directly relating the physical characteristics
of lighting technologies to the relatively abstract domains
of worker mood and cognition.