The Light Sensor Mod 1.4.7 adds a new craftable block, that is a new input for redstone mechanisms. It turns on if it is hit with a 12 light levels. It is crafted with five redstone powder in a + shape, with four iron, one in each corner.
How to install:
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Download Links for Light Sensor Mod 1.4.7
For Minecraft 1.4.7
For Minecraft 1.4.6
For Minecraft 1.4.5