600 watt hps light question

I am about to start my third medical grow and have a question about light penetration. How tall could I grow my plants with 2 600 watt HPS in a 5.5 x 5.5 x 9 foot grow room. I will have 6 plants in 7 gallon grow bags. Would like to increase my yield so I can donate more to those who can't afford to pay dispensary prices. Any advice is appreciated.

I think it all depends on your style of growing. I can't give an exact answer to your question, but I have this HPS chart that will hopefully shed some light (haha, pun intended).

greywind said:

I think it all depends on your style of growing. I can't give an exact answer to your question, but I have this HPS chart that will hopefully shed some light (haha, pun intended).
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Looking at light chart, you will not get optimum light penetration with 600 watt HPS if your plants get more then 3-3 1/2 feet. Not sure longer vegi time is worth it