Light Sensor 7x
169UPDATE: This model has been mostly obsoleted by the 12x
http://www.youtube.com/watch?v=ND3Emp2x9eU
This day/night sensor is about 7 times more powerful than the Nano, and most other single-grass-block sensors. This video shows you how to build it and goes inside the machine to see how it works (skip to 11:55 if you just want to see the latter).
More info and discussion:
http://www.minecraftforum.net/topic/658827-compact-light-sensors-1x7x14x-sens...
The smaller but less sensitive Light Sensor Nano:
http://www.youtube.com/watch?v=bWxp2vuolHA
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