Best Lights for a Koi Pond

Hi

I am just about to assist my friend in building a 12 000 litre koi pond.
It will be made from cement blocks and rendered in waterproofed plaster
and finally fibreglassed.

So the lights will be incorporated into the walls during construction.

Are there any particular lamp types that provide the best night time
viewing. Lights that can really bring out the colour of the fish like
aquarium florescent lights do?

Would LED lamps be good?

Thanks\\Trevor