1st "Stealth" CFL Grow

Hey guys, this is my first time growing at all. I'm attempting at growing stealthy by using a rubbermaid 18 gallon container. I've got 2-100 equiv. lights(said something about daylight spectrum?). im currently growing 4 plants(unknown strains) 2 are about 3 weeks old from seed. 2 are about 4 days from seed. plants are on a 16/8 light schedule.

i have 2 questions:

Can i expect a good yield for just personal use from 4 plants?

and

How soon can i start flowering? both plants farther along have 3 sets of leaves and the plant is about 7 inches tall.(i dont expect to flower soon)

will post pics soon.

Thanks in advanced(sorry if i asked noobish questions)
 
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