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P
well the cab is a bit too small for the HPS cooltube system the cost/outcome ratio isnt good IMO
id better go with a nice pack of fluros and CFLs - i grow some lowriders under CFL now
and u might find my grow interesting - i would recomend u to read it ull get some info there
and dont belive those formulas for calculating the exhaust fan power
just add +1/2 or more power to the result it give u and thatll be allright
the 500 CMH is maximum power for your setup (sorry for the metric system)
the lowest is 250-300 CMH
good luck
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