Replacement Tube Lamp Aquarium Light
BLUE CORAL BOYU 20W T8 590mm diameter 26mm 

In the marine environment and the shorter waves are attenuated rapidly longer because water is opaque with respect to UV and especially red light, but fairly transparent to blue and green light. This feature makes the oceans as you go deeper, are becoming monochromatic. This feature is especially important mentioned as the coral reefs in the light of prevailing majority form is light blue. Below the first 10-15 meters deep, almost nothing remains of red and yellow, with light prevailing mostly only the green and the blue.

corals and everything you do photosynthesis needs light blue.

The light blue (cold) has a color temperature of about 10,000 degrees Kelvin