fluoro ballasts

i know fluoro ballasts arn't the best for growing but how many grams could one expect to get from a plant growing under 4 cool white fluoro ballasts totalling 3800 lumens

man thats a total open question with shit loads of variables but here it goes, say you had a decently bushy plant with some good side branches that was tied down so it could take advantage of the length of the tubes i think 2 oz is a totally attainable amount but then again its tough to say

sweet as mate thanks for your answer