I do not what your background is. But you might want to start with researching the LEDs. Then how the light behaves in water. And in air. And how to measure light and what all the number mean. And then photosynthesis and the marine life requirement for light. - All that is free(ish) at the local aquarium, library and the internet.
How will you drive LEDs? CC or CV? How to prevent flickering? How to design safety circuits so nobody and nothing gets fried? Heat dissipation? Etc..
Will you prototyping and manufacturing in your home country or abroad? Fees, taxes, royalties, duties?
Now that you have all that follow @jda advice.
As for the light - keep is simple and design to be modular - forget about wifi and app for now - if you market it right you can sell that later as an addon (all you need is access to 6 pin connector for 4 channels wifi driven controller)
How will you drive LEDs? CC or CV? How to prevent flickering? How to design safety circuits so nobody and nothing gets fried? Heat dissipation? Etc..
Will you prototyping and manufacturing in your home country or abroad? Fees, taxes, royalties, duties?
Now that you have all that follow @jda advice.
As for the light - keep is simple and design to be modular - forget about wifi and app for now - if you market it right you can sell that later as an addon (all you need is access to 6 pin connector for 4 channels wifi driven controller)