Quote:
Originally Posted by NepNut
That's interesting, if I understand correctly, high K light (actinic) mostly produce blue light with wavelength roughly between 400-500 nm. The chrolophyll is most effective in absorbing light wavelength of 430nm and 660nm. So theoretically speaking grow light (4000K), Daylight (5000K) and Super Daylight (6500K) fluoresent lamp should be more effective since they produce full spectrum light.
In nature high K environment is mostly found underwater >15 feet deep.... Hence high K is shouldn't be more effective compared to those full spectrum light when growing terrestrial plants... right?? 
I used to be nuts with planted tanks....  |
To share wat i know so far, we normally need to have 3 kind of T5 lights which are white (around 10k), blue & actinic. In a marine environment, blue & actinic spectrum is a must for them to grow and maintain colour. There are also people who use 20k bulb so that they only need to add a actinic lamp instead of using all 3 kinds.
So, i believe corals are almost same as plant, they do photosintesis as well but they have other important factors as well.
I will be adding in a actinic light to the current white T5 light next week to study the effects of the combination. I hope i can get some good news