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Abstract. Females of the blowfly, Calliphora vicina, showed an increase in the free‐running period (γ) of their locomotor activity rhythm when transferred from continuous darkness (DD) to continuous ‘dim’ light (LL) at an irradiance below about 0.03 Wm‐2. Transfer to LL of this intensity also caused a reduction in the duration of the active phase (α) of the cycle. Transfer to ‘bright’ light (>0.03 Wm2), however, lead to arrhythmicity. Data suggest that constant light of this intensity does not ‘stop’ the circadian pacemaker but imposes behavioural arrhythmicity at a more superficial level.

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