newhobby said:What is the difference between the 10, 14 and 20K?
Yes, yes, and yes. PAR is usually higher in lower kelvin bulbs. The spectrums are very different with high kelving bulbs having more blue wavelengths and less reds (red/blue used generically). Growth rate, color and form have been shown to be different under different spectrums.newhobby said:Is there any difference as far as light output, spectrum or coral growth?
Sorta. Blue here is genericlu used and from an LED it is a bandpass spectral emission: meaning, you dont get "all colors of blue". You will definately miss out on the "violet/UV" side of blue if you try and account for a MH lack of blue by using LEDs. This isn't necessarily bad, but it isn't an equivalent substitution.Since I already have Royal Blue LEDs, I can always supplement it to get more blue, right?
Yes, you are on the right path for something It depends on your goal. I'm sure coral will grow fine under both options you mentioned.I thinking on sticking with the 14K and place some blue LEDs. Am I in the right path?
Or should I just dump the blues and go 20K only instead?