To reduce your dependence on the grid power, consider using solar LED lights, Smart LED Solar Wall Lamp with PIR Sensor. Make the lighting of your driveways, pathways, backyard, or garden a little bit smarter. The inbuilt  Li-ion 3.7 volt 2200 mAh battery charges for around 8 hours and this amount of power is high enough to light up the sensor for 12 hours. These lights are waterproof(can easily overcome day-to-day dampness) and shockproof. PIR sensors use infrared rays for motion detection. At standby, light is automatically set on 75 lumens, and the lumen output goes up 600 lumens upon the detection of motion. 

These lights last up to 50,000 hours and do not require as much maintenance. As of now, the light is available in 6 watts and the color temperature is 4000k.