Fig. 8. Light stimulates rapid eclosion in competent flies, but also appears to have a second, delayed, effect. (A) Data from the w¹¹¹⁸xUAS-rpr pulse experiment (Fig. 2B,C) show that the proportion of flies that eclosed during the first 10 min of the 20 min light pulse (white bars) was roughly equivalent to the proportion that eclosed over the corresponding 60 min interval in the dark (bracketed by dashed lines). (B) Summary of the effects of light on eclosion, adapted from the w¹¹¹⁸xUAS-rpr pulse experiment (Fig. 2C). Dashed arrows indicate the intervals over which flies that have released EH are recruited to eclose by a LOn signal. Pharate adults that had released EH and were competent to eclose within approximately 60 min were recruited to eclose in the first 10 min after light exposure (gray arrow). If the pool of competent flies all eclosed at or shortly after LOn, the amount of eclosion after the light pulse would be expected to diminish to 0 (thick black line). Instead, the proportion of flies eclosing went down to only approximately 2% (thin black line) possibly as a result of light stimulating EH release in a group that was developmentally mature and ready to eclose.