Some lightings work for all types of tank. However, many of them are for a specific one. It is either best for Freshwater aquarium or Saltwater aquarium or Coral reef tanks; or two of them; or both. Their design provides the best condition for the tank they belong to, but not really good for others.
Aquarium Lighting - Marine Depot
The best aquarium LED lighting for your fish tank depends on the type of aquarium that you plan to have. This could be saltwater, freshwater, fish-only, reef or planted. This leaves quite a large range of aquarium lighting types that means you have more change to end up making a wrong choice. Of course nobody wants to buy the wrong thing, so I have compiled this complete guide to help you to choose the right LED lighting for your fish tank type.
Aquarium Lighting: Quick Guide to Aquarium Lighting
Lighting that as closely duplicates the sun (not necessarily light that is most pleasing to us) is important for ALL life, although more noticeably for corals and plants. Fish too are part of this chain of life. Basically if you take away the sun and the energy it provides, you take away life itself and I do not think if you are trying to achieve the best environment for your fish whether fresh or saltwater, you are doing them a favor by depriving of this source of energy, so duplicating this is one more part of your "aquarium keeping puzzle".
whats the best lighting for a reef tank