Day light detector

Put the summary of the bug you're having here

*What I expected to happen was the Daylight Detector block shouldn't powered the redstone repeater.
It is because there were no daylight.

*What actually happened was the Daylight Detector block powered the redstone repeater.

Steps to Reproduce:
1.time set NIGHT
2 make a room that 5x5x5
3 just... just watch the video- -...
4 http://www.youtube.com/watch?v=kAUxrItT0S4