I have to say this are so efficient in my opinion. I got this to light my outdoor porch and also in case of a power outage. Always handy to have some sort of solar power lights. And this don't disappoint. I love that they're waterproof and you can turn them on automatically or manually and the power last up to 10 hours and it's free. My electric bill doesn't go up like crazy. This are definitely a must and easy to set up in your outdoor or indoor around outdoor decorations.