|Source Mod||RedPower 2|
The Light Sensor is a block added by the RedPower 2 mod that detects how much light from the sky (either sunlight or moonlight) is falling on it. If sufficient light falls on it, then it will output a Redstone signal. It has four different levels of adjustment to determine how much light is necessary to output a Redstone signal. The most inclusive level outputs a Redstone signal even at midnight if the moon is visible, while the most exclusive level works only in full daylight. It can be adjusted by Shift+Right clicking it with a Screwdriver.