The black soldier fly (Hermetia illucens) has been adopted as a new resource for the animal feed sources for its high nutritional value and easily cultured on organic streams. However, black soldier fly larvae are very sensitive to abiotic factors such as light. Currently, there are scarcity of information about the impact of light on pupation. This study examined the effect of daylight duration on the pupation time and adult emergence of black soldier fly prepuae. The pupation time and adult emergence were estimated for new prepupae treated at 0 h, 04 h, 8 h, and 12 h of light, under 29°C and 68% relative humidity. Adult successfully emerged in all treatments. Prepupae 0 h treated took shortest time to emerge adult, although 12 h treated prepupae needed longest time. Adult emergence percent was highest in 0 h treatment among other treatments and lowest in 12 h.