... when people pass by. 20mA/80Vdc when nobody at porch.Maximum energy saving. Can be customized according to your detailed ... , low temperature rise, low calorific value.2. High stability, drive stable work, output current constant, no drift.3. High security, suitable ... over-voltage, over-current, overheat protective circuit.4. Has the maximum output power limiting function, to avoid the impact of the LED ...