The best aquarium light to buy?

Natural sunlight, while great, will increase algae growth which is something you don't want.

I think most full spectrum LED lamps and lights designed for saltwater tanks do just find and aren't too expensive.

I prefer 8,000K White This spectrum is ideal for live planted aquariums as it mimics shallow water conditions and usually produces higher PAR (ppfd) for stronger plant growth. And this gives a very natural look to your aquarium.

I use 50% white light and 50% blue light for my reef aquarium as this helps my coral grow.