3.5 to 4in of grouth in 9 days....good place to be?

i did a bunch of adjusting on ph..ppm...temp and more light..useing 2 400watt hps and mhd. just want to know if thats good or not?

growth* lol mt

Your question has very many answers depending on a few things.

What strain is it?
What system are you growing in?
What stage of growing are you at?
What is the root system like?
What Nutrients and additives are you using?

Probably one of the things to look out for the most is the inter-nodal spacing. The correct use of light and temps can really affect this and its one of the things a lot of people overlook.

If you give us some more info on the above questions then I will do my best to answer your questions..

Stay cool,
Doobz

its not great but its okay growth but as doobs said some plants put out more nodes closer so height growth at certain speed might not mean much if there short n bushy