I would be surprised if this hasn't been made yet, but I couldn't find a good version when I searched so here goes.... I was buying some on sale Christmas LED lights (70 C6, 4.8 watts, ~20 feet) and was thinking of how useful it would be to have these, or a string of something similar, possibly even landscape lights, hooked up to a light sensor so that when it got dark outside the lights would automatically come on. I have tried the solar landscape lights and have been pretty disappointed with them. I think that a few of these LED lights strung together would provide a great way to illuminate walkways, house perimeters, anything really at a low price and low power usage. I figure one string on for about 12 hours at most of darkness would be the same as having a 60 watt bulb on for 1 hour. From what I have seen the low voltage lighting sets are usually relatively expensive (~$80) and I would think that this sensor/led light idea of mine could easily be done for ~$20-$30. That said, has anyone seen anything like this or know why it wouldn't work? If this hasn't been done before, I think someone could make some real money on something like this.