Edit: found the answer to my last question. New question: How much is too much? If I have 1 plant with like 6-10 23w bulbs is that going to hurt my plant?
If you dont have any temp issues, get as many as you can fit in your box/space. I got close to 300watts for two plants and plan on getting more. Mixing up the spectrum seems to work well too. Goodluck!