Question: How does LED lighting work and number of projected color temperature?
About the article "The Night Watch", section "New LED illumination".

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Branches of stagecraft.
Lighting involves the process of determining the size, intensity, shape, and color of light for a given scene.
Typical work includes hanging, focusing, procurement and maintenance of fixtures as well as some aspects of show control.
Electrician (theatre) Color temperature  Intelligent lighting - LED stage lighting - Light plot - Stage lighting - Stage lighting instrument - Stage lighting accessories  
 applications.
For lighting building interiors, it is often important to take into account the color temperature of illumination.
For example, a warmer (i.e., lower color temperature) light is often used in public areas to promote relaxation, while a cooler (higher color temperature) light is used to enhance concentration in offices.CCT dimming for LED technology is regarded as a difficult task, since binning, age and temperature drift effects of LEDs change the actual color value output.
Here feedback loop systems are used for example with color sensors, to actively monitor and control the color output of multiple color mixing LEDs. 
YouTube shows Dreyer teaching for USITT's 2009 show, teaching on 'lighting various skintones','using color', 'the basics of lighting', 'how to design', and 'do lighting colors change?'
On 26 October 2011, the Rijksmuseum unveiled new, sustainable LED lighting for "The Night Watch".
With new technology, it is the first time LED lighting has been able to render the fine nuances of the painting's complex color palette.
The lighting was developed by Philips Lighting and was inaugurated by Rijksmuseum Director Wim Pijbes and Philips President and CEO Frans van Houten.
Rogier van der Heide, Chief Design Officer at Philips Lighting, was responsible for creating the system.
The new illumination uses LED lights with a color temperature of 3,200 kelvins, similar to warm-white light sources like tungsten halogen.
It has a color rendering index of over 90, which makes it suitable for the illumination of artifacts such as "The Night Watch".
Using the new LED lighting, the museum saves 80% on energy and offers the painting a safer environment due to the absence of UV radiation and heat.
When considering lighting for an aquarium, there are generally two factors to consider: wattage and color temperature.
Depending on the type of lighting (i.e.
fluorescents, metal halide, etc.)
the wattage of light emitted may vary considerably, from tens of watts to several hundred watts in a lighting system.
Wattage, while not indicative of color, is equivalent to power and essentially determines how brightly the light will shine.
Due to the scattering of light in water, the deeper one's tank is, the more powerful the lighting required.
Color temperature, measured in kelvins (albeit slightly unrepresentively) refers to the color of light being emitted by the lamp and is based on the concept of blackbody radiation.
Light from the sun has a color temperature of approximately 5900 K and lighting systems with color temperatures >5000 K tend to be best for growing plants in both the marine and freshwater setting.
10,000 K light appears bluish-white and emphasizes coloration in fishes and corals.
Higher up on the spectrum there are 14,000 K and 20,000 K bulbs that produce a deep blue tint which mimic the lighting conditions underseas, creating an optimal ambience for invertebrates and livestock present.