Did I say you couldn't grow it with less light than the optimum levels I gave? No. What you and so many people on here fail to understand, is that guessing (because that's all you're doing) what levels of light are required for growth will not give you OPTIMUM growth levels, yields and economy.
By understanding what the optimum light levels are for each growth phase you can maximise your yields and how much it costs you to produce those yields. Correct me if I'm wrong, but is that not what this board is about? Is it not about helping and advising and educating people to maximise their plants potential for the least amount of dollar outlay?
You've seen people on here grow with less light than the optimum and still have decent results, I've seen plenty of people on here spending a fair amount of money on this and not maximising their yield potential.
If my efforts to help people maximise their results hurts your pride a little bit - tough luck.