depends on many factors what medium, lightbulb, how many plants, using known clones or sprouting new seeds, your ventilation, etc., etc.
tho as a general rule of thumb a good grower can easily get 500grams off a 1000w
a great grower can double that number
a noob grower will be lucky to see half that
hope that helps you see that there is no definite answer for your question many factors to consider and many of them are up to you and your knowledge and experience