Block Light Activated Button

This new button is crafted from an Amethyst Shard and any normal Button.

When the Light Level rises above some threshold, the Button activates.  The duration of activation depends on what type of "normal" button it was crafted with.

Right Clicking the Button increases the light threshold needed to activate, cycling from 15 to 0.

Sneak-Right Clicking the Button decreases the light threshold needed to activate, cycling from 0 to 15.

Punching the Button toggles it to activating in response to the light level falling below the Button's threshold.

Measuring the Button with a Redstone Comparator when the Button is inactive gets the block light level at the button's location, or fifteen minus the block light level, depending on whether the block is in "detect increasing light" mode or "detect decreasing light" mode.