So many other things besides the lights factor in to your yields; your soil, nutrients, growing skills, strain, phenotype, etc. Most dwarf strains grown well can yield anywhere from 1 oz. to 3 oz. or more. Growing in Deep Water Culture can doubt or triple that. If this is your first grow and you need help and advice, check out the New Growers forum, Reference Links and Tips and Tricks Knowledge Base for lost of good reading. Also read the stickied threads. It might also be helpful to check out the various grow journals and find someone who has a setup similar to yours, or who is growing the same strains. Always helpful to see how someone else is doing it.