... the dark (ambient illuminaceace≤2lux), this light will turn on automatically if someone moves in or sound, andwill keep on for ... use special sensor to detect the change of the infrared spectrum that human body releases, switch on automatically when it detects the ... 100% load; when people leave, it turns off 90% load automatically, delaytime is 60s,90s,180s(optional), not interfered with by ...