What is the tank light that illuminates blue?

Question

I have a tank w/ several fish that i have had for months and i am also getting rid of fish but thats all besides the point. Anyways im basically starting my tank over and i saw it in like dental offices, and some saltwater tanks, that there is a light that illuminates almost a blue light. Anyone know what its called??

Answer 1

blue actinic lighting. This lighting is used in saltwater reef tanks for the benefical algae in the corals.   often paired with the 10000k lighting for veiwing.

Answer 2

The blue lights are called actinic lights.  There are also a lot of lights that are half actinic and half white light which are called 50 50 but the blue ones are 420 nm actinics (nanometer actinic.)

Answer 3

it could be a UV sterilization bulb or unit.

i'm not really sure.

or it's a fluorescent bulb that puts off really pure white light.

Answer 4

the ones colored blue

Answer 5

Most blue  i ever saw was the LED lights.

Answer 6

Maybe a black light, they're actually blue. However they can harm fish.

Answer 7

They are actinic lights, though when using them on freshwater most people do a 50/50 with a flourescent tube and an actinic tube.