Bill
Light requirements can change with how you grow and your budget. I would be happy to help you but I need to know how are going to grow, the room size and height?

Will you be growing with soil or go hydro? If you are choosing hydro what method are you using?

How about budget?

Last what yield would you like to achieve?

In truth it takes about 3 grows before the equipment is paid off so budget for that. Saying you can upgrade later is one thing but you need a good base foundation to start. Good light, good nutrients, good air flow, cool temperatures, and a controlled environment.
Zandor Reviewed by Zandor on . Square feet and Watts.............? What is the amount of watts you want to have per square foot? Example Question: Is one 400w HPS enough to grow two plants within 4 sq ft.? Rating: 5