Now this street lamp turns on at night time and turns off at day time and I have been using this creation for my city. And it works great. I would recommend city builders to install this automatic redstone street lamp in there city streets rather than using torches which feels like if you where in a cave right?
The idea is great. And compact. But still it's to big for me. I would never place this as my street lights. I just use a Redstonelamp with an inverted Daylightsensor on top of it. So my lamp just needs 1x1.5 blocks.