Calibrated Redstone Lamp

The Colour of the lamp is determined by the redstone strength powering into it. At a redstone power of 0, there is no power, so the block is both black/off. 

At redstone of 1 input into the calibrated redstone lamp it would display a red light. Since we now have coloured lighting it would fit in. And thus all 16 colours in the game would be added to the calibrated lamp and since there are also 16 redstone levels it is cohesive. 

Craftig would use an amethyst shard when making the redstone lamp to convert it into a calibrated redstone lamp. Or it could be an addition to the redstone lamp. 

possibly instead of a whole calibrated lamp we could have 3 different coloured lamps in red, green and blue. so when the colours mix we can make an LED display. Also the redstone signal would be from 0 - 8 n signal strength to turn the LEDs on. Each higher level would make the red green or blue lamps brighter and 1 woul be the dimmest. Using this we can have an assortment of colours and potentialy even make coloured displays.