the higher the number the bluer the light. the lower the number the more yellow the light. I have a 14K on my 10 gal and love it. 20K and your corals will probably look like smurfs.
should i get the 70 w sunpod becuase i've noticed that when buying corals under halides that when they come back to my pc that they lose a lot of color. Will lps and softies do good under this? I have a ten gallon
You should be fine with that. I just bought a DIY 70W HQI for my 10 and I am keeping a purple monti. cap. If I where you I would go for the 14K bulb they look nice. I think mine came with an astralux.