The responses of the flies to the various lamps appeared to depend on the origin, sex and age of the
houseflies, the spectral composition and irradiance of the test lamps, and on ambient illuminance. Overall, flies younger than 3 days were hardly or not attracted to the test lamps, whereas older flies were positively phototactic.
http://dissertations.ub.rug.nl/FILES/faculties/science/2003/r.c.smallegange/thesis.pdf
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